Google favicon crawler causing ActionView::MissingTemplate exception on Rails 3.2 - ruby-on-rails

I got an ActionView::MissingTemplate exception every time Google Favicon crawler tries to get my root url accepting only the image/* format.
The crawler user agent is:
Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20110814 Firefox/6.0 Google Favicon
I can reproduce this exception with this command:
curl -v -H "Accept: image/*" http://localhost:3000
I'm using a custom layout, named omega (on /layouts/omega path), can this affect the framework like that?
Isn't this a misbehavior?
How can I solve this and serve the favicon?
The error log:
ActionView::MissingTemplate at /
================================
> Missing template /layouts/omega/_index with {:locale=>[:"pt-br", :pt, :en], :formats=>["image/*"], :handlers=>[:erb, :builder, :coffee]}. Searched in:
* "/home/samuel/www/myapp/app/views"
* "/home/samuel/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/kaminari-0.16.3/app/views"
* "/home/samuel/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/declarative_authorization-0.5.7/app/views"
* "/home/samuel/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/devise-3.4.1/app/views"
* "/home/samuel/www/myapp"
* "/"
app/controllers/properties_controller.rb, line 280
--------------------------------------------------
``` ruby
275 redirect_to root_path, status: :moved_permanently
276 else
> 280 render '/layouts/omega/_index'
282 end
283 end
284 return
285 end
```
App backtrace
-------------
- app/controllers/properties_controller.rb:280:in `show'
Full backtrace
--------------
- actionpack (3.2.22) lib/action_view/path_set.rb:58:in `find'
- actionpack (3.2.22) lib/action_view/lookup_context.rb:122:in `find'
- actionpack (3.2.22) lib/action_view/renderer/abstract_renderer.rb:3:in `find_template'
- actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:28:in `block in determine_template'
- actionpack (3.2.22) lib/action_view/lookup_context.rb:143:in `with_fallbacks'
- actionpack (3.2.22) lib/action_view/renderer/abstract_renderer.rb:3:in `with_fallbacks'
- actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:28:in `determine_template'
- actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:10:in `render'
- actionpack (3.2.22) lib/action_view/renderer/renderer.rb:36:in `render_template'
- actionpack (3.2.22) lib/action_view/renderer/renderer.rb:17:in `render'
- actionpack (3.2.22) lib/abstract_controller/rendering.rb:110:in `_render_template'
- actionpack (3.2.22) lib/action_controller/metal/streaming.rb:225:in `_render_template'
- actionpack (3.2.22) lib/abstract_controller/rendering.rb:103:in `render_to_body'
- actionpack (3.2.22) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
- actionpack (3.2.22) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
- actionpack (3.2.22) lib/abstract_controller/rendering.rb:88:in `render'
- actionpack (3.2.22) lib/action_controller/metal/rendering.rb:16:in `render'
- actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
- activesupport (3.2.22) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
- /home/samuel/.rbenv/versions/2.2.2/lib/ruby/2.2.0/benchmark.rb:303:in `realtime'
- activesupport (3.2.22) lib/active_support/core_ext/benchmark.rb:5:in `ms'
- actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
- actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
- activerecord (3.2.22) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
- actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:39:in `render'
- app/controllers/properties_controller.rb:280:in `show'
- actionpack (3.2.22) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
- actionpack (3.2.22) lib/abstract_controller/base.rb:167:in `process_action'
- actionpack (3.2.22) lib/action_controller/metal/rendering.rb:10:in `process_action'
- actionpack (3.2.22) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
- activesupport (3.2.22) lib/active_support/callbacks.rb:492:in `block in _run__3499709650331313942__process_action__3074038669074245940__callbacks'
- activesupport (3.2.22) lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_548'
- marginalia (1.3.0) lib/marginalia.rb:77:in `record_query_comment'
- activesupport (3.2.22) lib/active_support/callbacks.rb:214:in `_conditional_callback_around_548'
- activesupport (3.2.22) lib/active_support/callbacks.rb:447:in `_run__3499709650331313942__process_action__3074038669074245940__callbacks'
- activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `__run_callback'
- activesupport (3.2.22) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
- activesupport (3.2.22) lib/active_support/callbacks.rb:81:in `run_callbacks'
- actionpack (3.2.22) lib/abstract_controller/callbacks.rb:17:in `process_action'
- actionpack (3.2.22) lib/action_controller/metal/rescue.rb:29:in `process_action'
- actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
- activesupport (3.2.22) lib/active_support/notifications.rb:123:in `block in instrument'
- activesupport (3.2.22) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
- activesupport (3.2.22) lib/active_support/notifications.rb:123:in `instrument'
- actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
- actionpack (3.2.22) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
- activerecord (3.2.22) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
- actionpack (3.2.22) lib/abstract_controller/base.rb:121:in `process'
- actionpack (3.2.22) lib/abstract_controller/rendering.rb:45:in `process'
- rack-mini-profiler (0.9.7) lib/mini_profiler/profiling_methods.rb:106:in `block in profile_method'
- actionpack (3.2.22) lib/action_controller/metal.rb:203:in `dispatch'
- actionpack (3.2.22) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
- actionpack (3.2.22) lib/action_controller/metal.rb:246:in `block in action'
- actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
- actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:36:in `call'
- journey (1.0.4) lib/journey/router.rb:68:in `block in call'
- journey (1.0.4) lib/journey/router.rb:56:in `call'
- actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:608:in `call'
- mongoid (2.4.11) lib/rack/mongoid/middleware/identity_map.rb:33:in `block in call'
- mongoid (2.4.11) lib/mongoid.rb:133:in `unit_of_work'
- mongoid (2.4.11) lib/rack/mongoid/middleware/identity_map.rb:33:in `call'
- warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
- warden (1.2.3) lib/warden/manager.rb:34:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
- rack (1.4.7) lib/rack/etag.rb:23:in `call'
- rack (1.4.7) lib/rack/conditionalget.rb:25:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/head.rb:14:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/flash.rb:242:in `call'
- rack (1.4.7) lib/rack/session/abstract/id.rb:210:in `context'
- rack (1.4.7) lib/rack/session/abstract/id.rb:205:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/cookies.rb:341:in `call'
- activerecord (3.2.22) lib/active_record/query_cache.rb:64:in `call'
- activerecord (3.2.22) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
- activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `_run__4348557046124021977__call__3061323192353778014__callbacks'
- activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `__run_callback'
- activesupport (3.2.22) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
- activesupport (3.2.22) lib/active_support/callbacks.rb:81:in `run_callbacks'
- actionpack (3.2.22) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/reloader.rb:65:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
- better_errors (2.1.1) lib/better_errors/middleware.rb:84:in `protected_app_call'
- better_errors (2.1.1) lib/better_errors/middleware.rb:79:in `better_errors_call'
- better_errors (2.1.1) lib/better_errors/middleware.rb:57:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
- railties (3.2.22) lib/rails/rack/logger.rb:32:in `call_app'
- railties (3.2.22) lib/rails/rack/logger.rb:16:in `block in call'
- activesupport (3.2.22) lib/active_support/tagged_logging.rb:22:in `tagged'
- railties (3.2.22) lib/rails/rack/logger.rb:16:in `call'
- quiet_assets (1.1.0) lib/quiet_assets.rb:27:in `call_with_quiet_assets'
- actionpack (3.2.22) lib/action_dispatch/middleware/request_id.rb:22:in `call'
- rack (1.4.7) lib/rack/methodoverride.rb:21:in `call'
- rack (1.4.7) lib/rack/runtime.rb:17:in `call'
- activesupport (3.2.22) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
- rack (1.4.7) lib/rack/lock.rb:15:in `call'
- actionpack (3.2.22) lib/action_dispatch/middleware/static.rb:83:in `call'
- rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
- rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
- rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
- rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
- rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
- honeybadger (2.0.6) lib/honeybadger/rack/error_notifier.rb:33:in `block in call'
- honeybadger (2.0.6) lib/honeybadger/config.rb:189:in `with_request'
- honeybadger (2.0.6) lib/honeybadger/rack/error_notifier.rb:30:in `call'
- honeybadger (2.0.6) lib/honeybadger/rack/user_feedback.rb:29:in `call'
- honeybadger (2.0.6) lib/honeybadger/rack/user_informer.rb:19:in `call'
- rack-mini-profiler (0.9.7) lib/mini_profiler/profiler.rb:276:in `call'
- railties (3.2.22) lib/rails/engine.rb:484:in `call'
- railties (3.2.22) lib/rails/application.rb:231:in `call'
- rack (1.4.7) lib/rack/content_length.rb:14:in `call'
- railties (3.2.22) lib/rails/rack/log_tailer.rb:17:in `call'
- thin (1.6.3) lib/thin/connection.rb:86:in `block in pre_process'
- thin (1.6.3) lib/thin/connection.rb:84:in `pre_process'
- thin (1.6.3) lib/thin/connection.rb:53:in `process'
- thin (1.6.3) lib/thin/connection.rb:39:in `receive_data'
- eventmachine (1.0.7) lib/eventmachine.rb:187:in `run'
- thin (1.6.3) lib/thin/backends/base.rb:73:in `start'
- thin (1.6.3) lib/thin/server.rb:162:in `start'
- rack (1.4.7) lib/rack/handler/thin.rb:13:in `run'
- rack (1.4.7) lib/rack/server.rb:268:in `start'
- railties (3.2.22) lib/rails/commands/server.rb:70:in `start'
- railties (3.2.22) lib/rails/commands.rb:55:in `block in <top (required)>'
- railties (3.2.22) lib/rails/commands.rb:50:in `<top (required)>'
- script/rails:6:in `<main>'

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actionpack (3.2.22) lib/action_view/template.rb:244:in `block in compile!'
actionpack (3.2.22) lib/action_view/template.rb:232:in `synchronize'
actionpack (3.2.22) lib/action_view/template.rb:232:in `compile!'
actionpack (3.2.22) lib/action_view/template.rb:144:in `block in render'
activesupport (3.2.22) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.22) lib/action_view/template.rb:143:in `render'
rack-mini-profiler (0.9.6) lib/mini_profiler/profiling_methods.rb:106:in `block in profile_method'
actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template'
actionpack (3.2.22) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.22) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.22) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.22) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.22) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:46:in `block in render_template'
actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:54:in `render_with_layout'
actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:45:in `render_template'
actionpack (3.2.22) lib/action_view/renderer/template_renderer.rb:18:in `render'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:150:in `block in render_with_newrelic'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/method_tracer.rb:73:in `block in trace_execution_scoped'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/method_tracer_helpers.rb:82:in `trace_execution_scoped'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/method_tracer.rb:71:in `trace_execution_scoped'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:149:in `render_with_newrelic'
actionpack (3.2.22) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.22) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.22) lib/abstract_controller/rendering.rb:110:in `_render_template'
actionpack (3.2.22) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.22) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.22) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.22) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.22) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.22) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.22) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/dima/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
activesupport (3.2.22) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.22) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
thinking-sphinx (2.0.14) lib/thinking_sphinx/action_controller.rb:12:in `cleanup_view_runtime'
actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:39:in `render'
actionpack (3.2.22) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (3.2.22) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (3.2.22) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.22) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.22) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.22) lib/active_support/callbacks.rb:458:in `_run__270438694__process_action__945548129__callbacks'
activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.22) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.22) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.22) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.22) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.22) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.22) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.22) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.22) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.22) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.22) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:28:in `block in process_action'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:361:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:23:in `process_action'
actionpack (3.2.22) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.22) lib/abstract_controller/rendering.rb:45:in `process'
rack-mini-profiler (0.9.6) lib/mini_profiler/profiling_methods.rb:106:in `block in profile_method'
actionpack (3.2.22) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.22) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.22) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.22) lib/action_dispatch/routing/route_set.rb:608:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/rack/agent_hooks.rb:30:in `traced_call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/rack/browser_monitoring.rb:32:in `traced_call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/etag.rb:23:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/conditionalget.rb:25:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/head.rb:14:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/flash.rb:242:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.7) lib/rack/session/abstract/id.rb:205:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
config/initializers/flash_session_cookie_middleware.rb:19:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/cookies.rb:341:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
activerecord (3.2.22) lib/active_record/query_cache.rb:64:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
activerecord (3.2.22) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `_run__200222769__call__562425215__callbacks'
activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.22) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.22) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.22) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/reloader.rb:65:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
airbrake (4.3.0) lib/airbrake/rails/middleware.rb:13:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
railties (3.2.22) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.22) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.22) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.22) lib/rails/rack/logger.rb:16:in `call'
quiet_assets (1.1.0) lib/quiet_assets.rb:27:in `call_with_quiet_assets'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/request_id.rb:22:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/methodoverride.rb:21:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/runtime.rb:17:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/lock.rb:15:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/static.rb:83:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
airbrake (4.3.0) lib/airbrake/user_informer.rb:16:in `_call'
airbrake (4.3.0) lib/airbrake/user_informer.rb:12:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack-mini-profiler (0.9.6) lib/mini_profiler/profiler.rb:279:in `call'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
railties (3.2.22) lib/rails/engine.rb:484:in `call'
railties (3.2.22) lib/rails/application.rb:231:in `call'
railties (3.2.22) lib/rails/railtie/configurable.rb:30:in `method_missing'
newrelic_rpm (3.12.1.298) lib/new_relic/agent/instrumentation/middleware_tracing.rb:67:in `call'
rack (1.4.7) lib/rack/content_length.rb:14:in `call'
railties (3.2.22) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.5.1) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.1) lib/thin/connection.rb:79:in `catch'
thin (1.5.1) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.1) lib/thin/connection.rb:54:in `process'
thin (1.5.1) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.7) lib/eventmachine.rb:187:in `run_machine'
eventmachine (1.0.7) lib/eventmachine.rb:187:in `run'
thin (1.5.1) lib/thin/backends/base.rb:63:in `start'
thin (1.5.1) lib/thin/server.rb:159:in `start'
rack (1.4.7) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.7) lib/rack/server.rb:268:in `start'
railties (3.2.22) lib/rails/commands/server.rb:70:in `start'
railties (3.2.22) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.22) lib/rails/commands.rb:50:in `tap'
railties (3.2.22) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:23:in `require'
script/rails:23:in `<main>'

This error means that parts of your document are indented using 2 spaces and others using tabs.
You should unify the indentation method used across the file

ArgumentError - dump format error for symbol(0x69)

So I just upgraded to FontAwesome 4.0. Part of this change is the way icons are referenced.
No longer can you do: <i class="icon-beer"></i>.
Now...you have to replace icon with fa-, so the above now looks like this:
<i class="fa fa-beer"></i>
So in a stroke of brilliance I decided to replace all references to icon- in my project with fa fa-.
That included cached files, dump files, and all stylesheets, views, etc.
Now...when I try to load any page, I get this error:
ArgumentError at /
dump format error for symbol(0x69)
The log looks like this:
Completed 500 Internal Server Error in 1060ms
ArgumentError - dump format error for symbol(0x69):
activesupport (3.2.14) lib/active_support/cache.rb:587:in `value'
activesupport (3.2.14) lib/active_support/cache.rb:324:in `block in read'
activesupport (3.2.14) lib/active_support/cache.rb:520:in `instrument'
activesupport (3.2.14) lib/active_support/cache.rb:315:in `read'
sprockets (2.2.2) lib/sprockets/caching.rb:70:in `cache_get'
sprockets (2.2.2) lib/sprockets/caching.rb:45:in `cache_get_hash'
sprockets (2.2.2) lib/sprockets/caching.rb:15:in `cache_asset'
sprockets (2.2.2) lib/sprockets/index.rb:92:in `build_asset'
sprockets (2.2.2) lib/sprockets/base.rb:169:in `find_asset'
sprockets (2.2.2) lib/sprockets/index.rb:60:in `find_asset'
sprockets (2.2.2) lib/sprockets/environment.rb:78:in `find_asset'
sprockets (2.2.2) lib/sprockets/base.rb:177:in `[]'
actionpack (3.2.14) lib/sprockets/helpers/rails_helper.rb:126:in `asset_for'
actionpack (3.2.14) lib/sprockets/helpers/rails_helper.rb:44:in `block in stylesheet_link_tag'
actionpack (3.2.14) lib/sprockets/helpers/rails_helper.rb:43:in `stylesheet_link_tag'
app/views/layouts/application.html.erb:7:in `_app_views_layouts_application_html_erb___3926009726657617670_70158405610280'
actionpack (3.2.14) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.14) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.14) lib/action_view/template.rb:143:in `render'
rack-mini-profiler (0.1.31) Ruby/lib/mini_profiler/profiling_methods.rb:108:in `block in profile_method'
actionpack (3.2.14) lib/action_view/renderer/template_renderer.rb:60:in `render_with_layout'
actionpack (3.2.14) lib/action_view/renderer/template_renderer.rb:46:in `render_template'
actionpack (3.2.14) lib/action_view/renderer/template_renderer.rb:19:in `render'
newrelic_rpm (3.6.8.168) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:160:in `block in render_with_newrelic'
newrelic_rpm (3.6.8.168) lib/new_relic/agent/method_tracer.rb:259:in `trace_execution_scoped'
newrelic_rpm (3.6.8.168) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:159:in `render_with_newrelic'
actionpack (3.2.14) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.14) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.14) lib/abstract_controller/rendering.rb:110:in `_render_template'
actionpack (3.2.14) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.14) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.14) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.14) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.14) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.14) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.14) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.14) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/me/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
activesupport (3.2.14) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.14) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.14) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.14) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.14) lib/action_controller/metal/instrumentation.rb:39:in `render'
remotipart (1.2.1) lib/remotipart/render_overrides.rb:14:in `render_with_remotipart'
actionpack (3.2.14) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (3.2.14) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (3.2.14) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.14) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.14) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.14) lib/active_support/callbacks.rb:436:in `_run__3106556048525796011__process_action__1470226244061007336__callbacks'
activesupport (3.2.14) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.14) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.14) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.14) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.14) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.14) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.14) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.14) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.14) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.14) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.14) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.14) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.6.8.168) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:38:in `block in process_action'
newrelic_rpm (3.6.8.168) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:324:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.6.8.168) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action'
actionpack (3.2.14) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.14) lib/abstract_controller/rendering.rb:45:in `process'
rack-mini-profiler (0.1.31) Ruby/lib/mini_profiler/profiling_methods.rb:108:in `block in profile_method'
actionpack (3.2.14) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.14) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.14) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.14) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.14) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.14) lib/action_dispatch/routing/route_set.rb:608:in `call'
rack-pjax (0.7.0) lib/rack/pjax.rb:12:in `call'
newrelic_rpm (3.6.8.168) lib/new_relic/rack/error_collector.rb:43:in `call'
newrelic_rpm (3.6.8.168) lib/new_relic/rack/agent_hooks.rb:22:in `call'
newrelic_rpm (3.6.8.168) lib/new_relic/rack/browser_monitoring.rb:16:in `call'
bullet (4.6.0) lib/bullet/rack.rb:10:in `call'
meta_request (0.2.8) lib/meta_request/middlewares/app_request_handler.rb:13:in `call'
rack-contrib (1.1.0) lib/rack/contrib/response_headers.rb:17:in `call'
meta_request (0.2.8) lib/meta_request/middlewares/headers.rb:16:in `call'
meta_request (0.2.8) lib/meta_request/middlewares/meta_request_handler.rb:13:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.5) lib/rack/etag.rb:23:in `call'
rack (1.4.5) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/head.rb:14:in `call'
remotipart (1.2.1) lib/remotipart/middleware.rb:27:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.14) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.14) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.14) lib/active_support/callbacks.rb:405:in `_run__1838779961944472927__call__2777002074146462717__callbacks'
activesupport (3.2.14) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.14) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.14) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.14) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
better_errors (1.0.1) lib/better_errors/middleware.rb:84:in `protected_app_call'
better_errors (1.0.1) lib/better_errors/middleware.rb:79:in `better_errors_call'
better_errors (1.0.1) lib/better_errors/middleware.rb:56:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.14) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.14) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.14) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.14) lib/rails/rack/logger.rb:16:in `call'
quiet_assets (1.0.2) lib/quiet_assets.rb:18:in `call_with_quiet_assets'
actionpack (3.2.14) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.14) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
actionpack (3.2.14) lib/action_dispatch/middleware/static.rb:63:in `call'
rack-mini-profiler (0.1.31) Ruby/lib/mini_profiler/profiler.rb:278:in `call'
railties (3.2.14) lib/rails/engine.rb:484:in `call'
railties (3.2.14) lib/rails/application.rb:231:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.14) lib/rails/rack/log_tailer.rb:17:in `call'
thin (1.5.1) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.1) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.1) lib/thin/connection.rb:54:in `process'
thin (1.5.1) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.3) lib/eventmachine.rb:187:in `run'
thin (1.5.1) lib/thin/backends/base.rb:63:in `start'
thin (1.5.1) lib/thin/server.rb:159:in `start'
rack (1.4.5) lib/rack/handler/thin.rb:13:in `run'
rack (1.4.5) lib/rack/server.rb:268:in `start'
railties (3.2.14) lib/rails/commands/server.rb:70:in `start'
railties (3.2.14) lib/rails/commands.rb:55:in `block in <top (required)>'
railties (3.2.14) lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `<main>'
Thoughts on how I can fix this?

this happened to me, and i guessed that the reason was the global find-and-replace mucked around in the tmp directory, which caused some asset compilation problems
so i ran
rake tmp:clear
and the problem went away. maybe this helps someone.

You should first try to reverse the process, replacing every fa fa- with icon- again.
After that you can try to do the replacement again but only with your views folder, which should contain all the icon markup.

I ran into a similar problem, running perl -pi -e to replace references to a directory with something else:
dump format error for symbol(0x73).
In my case the problem turned out to be that a file with some SASS variables I had was suffixed ".css.scss" instead of ".scss", which for some reason broke the whole app.

Delayed Job and Rails Admin: uninitialized constant ActiveRecord::Base::Delayed::Job

Hi all SO users fixing bugs on Thanksgiving,
My delayed job setup is working fine, I have it running in production and development, but when accessing the users section of rails admin, I get the error
uninitialized constant ActiveRecord::Base::Delayed::Job
Am I supposed to define a delayed job class somewhere? If so, what's the correct syntax for that? Delayed::Job or DelayedJob? I've tried doing this with no success.
I also ran the migration to create the jobs table. Maybe there is an association between user and delayed job that is defined somewhere? Not too sure...
Here's a full trace:
ActionView::Template::Error (uninitialized constant ActiveRecord::Base::Delayed::Job):
10:
11: export_action = RailsAdmin::Config::Actions.find(:export, { :controller => self.controller, :abstract_model => #abstract_model })
12: export_action = export_action && authorized?(export_action.authorization_key, #abstract_model) ? export_action : nil
13:
14: properties = #model_config.list.with(:controller => self.controller, :view => self, :object => #abstract_model.model.new).visible_fields
15: # columns paginate
16: #filterable_fields = #model_config.list.fields.select(&:filterable?)
activerecord (3.2.3) lib/active_record/inheritance.rb:119:in `compute_type'
activerecord (3.2.3) lib/active_record/reflection.rb:172:in `klass'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/adapters/active_record.rb:233:in `association_model_lookup'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/adapters/active_record.rb:70:in `block (2 levels) in associations'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/fields/association.rb:63:in `call'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/fields/association.rb:63:in `associated_model_config'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/fields/association.rb:33:in `block in <class:Association>'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/configurable.rb:68:in `instance_eval'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/configurable.rb:68:in `block in register_instance_option'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/configurable.rb:42:in `block in register_instance_option'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/proxyable/proxy.rb:31:in `method_missing'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/has_fields.rb:113:in `select'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/has_fields.rb:113:in `visible_fields'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/proxyable/proxy.rb:31:in `method_missing'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/app/views/rails_admin/main/index.html.haml:13:in `__var_www_apps_miracleticket_shared_bundle_ruby_______bundler_gems_rails_admin____e____d__f_app_views_rails_admin_main_index_html_haml___3620510256847226470_59069620'
actionpack (3.2.3) lib/action_view/template.rb:143:in `block in render'
activesupport (3.2.3) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.3) lib/action_view/template.rb:141:in `render'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template'
actionpack (3.2.3) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.3) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:46:in `block in render_template'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:54:in `render_with_layout'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:45:in `render_template'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:18:in `render'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:156:in `block in render_with_newrelic'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:155:in `render_with_newrelic'
actionpack (3.2.3) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.3) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:110:in `_render_template'
actionpack (3.2.3) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.3) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.3) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.3) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.3) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/shark/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/benchmark.rb:295:in `realtime'
activesupport (3.2.3) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:39:in `render'
remotipart (1.0.2) lib/remotipart/render_overrides.rb:8:in `render'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/actions/index.rb:35:in `block (4 levels) in <class:Index>'
actionpack (3.2.3) lib/action_controller/metal/mime_responds.rb:196:in `call'
actionpack (3.2.3) lib/action_controller/metal/mime_responds.rb:196:in `respond_to'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/actions/index.rb:32:in `block (2 levels) in <class:Index>'
(eval):8:in `instance_eval'
(eval):8:in `index'
actionpack (3.2.3) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.3) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.3) lib/active_support/callbacks.rb:524:in `_run__2345189654170037202__process_action__1989048903076684056__callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.3) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/params_wrapper.rb:205:in `process_action'
activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:34:in `block in process_action'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:268:in `block in perform_action_with_newrelic_trace'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:263:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:33:in `process_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.3) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call'
railties (3.2.3) lib/rails/engine.rb:479:in `call'
railties (3.2.3) lib/rails/railtie/configurable.rb:30:in `method_missing'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call'
rack-pjax (0.6.0) lib/rack/pjax.rb:12:in `call'
omniauth (1.1.1) lib/omniauth/strategy.rb:177:in `call!'
omniauth (1.1.1) lib/omniauth/strategy.rb:157:in `call'
newrelic_rpm (3.5.0.1) lib/new_relic/rack/error_collector.rb:8:in `call'
newrelic_rpm (3.5.0.1) lib/new_relic/rack/browser_monitoring.rb:12:in `call'
sass (3.2.2) lib/sass/plugin/rack.rb:54:in `call'
exception_notification (3.0.0) lib/exception_notifier.rb:40:in `call'
warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
warden (1.2.1) lib/warden/manager.rb:34:in `catch'
warden (1.2.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/head.rb:14:in `call'
remotipart (1.0.2) lib/remotipart/middleware.rb:30:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.3) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:467:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `_run__3685644371886104563__call__3962699592338143344__callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
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rack (1.4.1) lib/rack/sendfile.rb:102:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.3) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.3) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.3) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
railties (3.2.3) lib/rails/engine.rb:479:in `call'
railties (3.2.3) lib/rails/application.rb:220:in `call'
railties (3.2.3) lib/rails/railtie/configurable.rb:30:in `method_missing'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/rack/application_spawner.rb:206:in `start_request_handler'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/rack/application_spawner.rb:171:in `block in handle_spawn_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/utils.rb:479:in `safe_fork'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/rack/application_spawner.rb:166:in `handle_spawn_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:180:in `start'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/rack/application_spawner.rb:129:in `start'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:253:in `block (2 levels) in spawn_rack_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:246:in `block in spawn_rack_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
<internal:prelude>:10:in `synchronize'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/helper-scripts/passenger-spawn-server:99:in `<main>'

It looks like some class somewhere is associated with the Delayed::Job class. I'm guessing that you've got the class_name option on that association with Delayed::Job specified. I'm not sure how that would work in practice as Delayed::Job isn't an active record class. You'd really have to associate with the active record backend for delayed jobs (Delayed::Backend::ActiveRecord::Job).
In the first instance it'd be worth commenting out that association and seeing if it works without it. In the second instance it'd be worth rethinking how to associate your users with the jobs being processed.

Timeout error - rescue in rbuf_fill (Engineyard)

My website has been up and running for a while on engineyard. Today, all of a sudden, I have been getting this error. This continuosly occured for about 5 to 10 minutes and then seems ok now. Any idea what causes this ? Also, any suggested cleanup or settings ? As such, there is no unusual activity on the website.
A Timeout::Error occurred in home#index:
Timeout::Error
/usr/lib/ruby/1.9.1/net/protocol.rb:140:in `rescue in rbuf_fill'
Backtrace:
/usr/lib/ruby/1.9.1/net/protocol.rb:140:in `rescue in rbuf_fill'
/usr/lib/ruby/1.9.1/net/protocol.rb:134:in `rbuf_fill'
/usr/lib/ruby/1.9.1/net/protocol.rb:116:in `readuntil'
/usr/lib/ruby/1.9.1/net/protocol.rb:126:in `readline'
/usr/lib/ruby/1.9.1/net/http.rb:2219:in `read_status_line'
/usr/lib/ruby/1.9.1/net/http.rb:2208:in `read_new'
/usr/lib/ruby/1.9.1/net/http.rb:1191:in `transport_request'
/usr/lib/ruby/1.9.1/net/http.rb:1177:in `request'
rest-client (1.6.7) lib/restclient/net_http_ext.rb:51:in `request'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/net.rb:22:in `block in request_with_newrelic_trace'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/net.rb:21:in `request_with_newrelic_trace'
/usr/lib/ruby/1.9.1/net/http.rb:1170:in `block in request'
/usr/lib/ruby/1.9.1/net/http.rb:627:in `start'
/usr/lib/ruby/1.9.1/net/http.rb:1168:in `request'
rest-client (1.6.7) lib/restclient/net_http_ext.rb:51:in `request'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/net.rb:22:in `block in request_with_newrelic_trace'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/net.rb:21:in `request_with_newrelic_trace'
/data/webinterface/shared/bundled_gems/ruby/1.9.1/bundler/gems/api_client-b950641bfce6/lib/api_client/api.rb:15:in `get'
/data/webinterface/shared/bundled_gems/ruby/1.9.1/bundler/gems/api_client-b950641bfce6/lib/api_client/show.rb:15:in `recommended'
app/controllers/application_controller.rb:229:in `set_public_home_page_params'
app/controllers/home_controller.rb:14:in `index'
actionpack (3.2.3) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.3) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.3) lib/active_support/callbacks.rb:469:in `_run__141284936__process_action__119629849__callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.3) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/params_wrapper.rb:205:in `process_action'
activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:34:in `block in process_action'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:268:in `block in perform_action_with_newrelic_trace'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:263:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.4.2.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:33:in `process_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.3) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:36:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call'
omniauth (1.1.1) lib/omniauth/strategy.rb:177:in `call!'
omniauth (1.1.1) lib/omniauth/strategy.rb:157:in `call'
omniauth (1.1.1) lib/omniauth/strategy.rb:177:in `call!'
omniauth (1.1.1) lib/omniauth/strategy.rb:157:in `call'
omniauth (1.1.1) lib/omniauth/builder.rb:48:in `call'
/data/webinterface/shared/bundled_gems/ruby/1.9.1/bundler/gems/exception_notification-192a49a02d63/lib/exception_notifier.rb:19:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.3) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:467:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `_run__857894770__call__169073287__callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.3) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.3) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.3) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.3) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.3) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
railties (3.2.3) lib/rails/engine.rb:479:in `call'
railties (3.2.3) lib/rails/application.rb:220:in `call'
railties (3.2.3) lib/rails/railtie/configurable.rb:30:in `method_missing'
/usr/libexec/passenger/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
/usr/libexec/passenger/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
/usr/libexec/passenger/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
/usr/libexec/passenger/lib/phusion_passenger/rack/application_spawner.rb:206:in `start_request_handler'
/usr/libexec/passenger/lib/phusion_passenger/rack/application_spawner.rb:171:in `block in handle_spawn_application'
/usr/libexec/passenger/lib/phusion_passenger/utils.rb:479:in `safe_fork'
/usr/libexec/passenger/lib/phusion_passenger/rack/application_spawner.rb:166:in `handle_spawn_application'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server.rb:180:in `start'
/usr/libexec/passenger/lib/phusion_passenger/rack/application_spawner.rb:129:in `start'
/usr/libexec/passenger/lib/phusion_passenger/spawn_manager.rb:253:in `block (2 levels) in spawn_rack_application'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
/usr/libexec/passenger/lib/phusion_passenger/spawn_manager.rb:246:in `block in spawn_rack_application'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server_collection.rb:82:in `block in synchronize'
<internal:prelude>:10:in `synchronize'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
/usr/libexec/passenger/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application'
/usr/libexec/passenger/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
/usr/libexec/passenger/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/usr/libexec/passenger/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/usr/libexec/passenger/bin/passenger-spawn-server:101:in `<main>'

My bad. The reason for this was because I had introduced a sleep for a few minutes in one of the controllers as I wanted a delayed execution. I think this caused the problem

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