Getting routing error time to time:"No routes matches..." - ruby-on-rails

Question

I have created a simple application with CRUD operations and application is working fine. But time to time i get an error saying "ActionController::RoutingError (No route matches [GET]...)".
When i restart the server,application starts working again.
Full Trace:
actionpack (4.1.1) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.1) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.1) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.1) lib/rails/engine.rb:514:in `call'
railties (4.1.1) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/Users/shobhitgarg/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/Users/shobhitgarg/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
/Users/shobhitgarg/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
Could anyone please help?
Adding Files:
routes.rb
require Rails.root.join("config/routes/testmin_routes.rb")
Rails.application.routes.draw do
root 'welcome#index'
end
testmin_routes.rb
Rails.application.routes.draw do
match 'admin/test_group/new' ,to:'admin/test_group#new',:via => :GET
match 'admin/test_group/create' ,to:'admin/test_group#create' , :via => :POST
match 'admin/test_group/edit' ,to:'admin/test_group#edit' , :via => :GET
match 'admin/test_group' ,to: 'admin/test_group#index', :via => :GET
match 'admin/test_group/update' ,to: 'admin/test_group#update', :via => :PUT
match 'admin/test_group/destroy' ,to: 'admin/test_group#destroy', :via =>:DELETE
end