NameError: uninitialized constant Sprockets::Rails::VERSION on pushing to heroku - ruby-on-rails

Question

I have an app which runs on local machine.
Rails 4.2.0
Ruby 2.2.3
I am getting the following error on pushing to heroku. The app runs on local machine.
rake aborts with the error NameError: uninitialized constant Sprockets::Rails::VERSION
Counting objects: 1965, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (608/608), done.
Writing objects: 100% (1965/1965), 229.38 KiB | 0 bytes/s, done.
Total 1965 (delta 1275), reused 1958 (delta 1272)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.2.3
remote: ###### WARNING:
remote: Removing `Gemfile.lock` because it was generated on Windows.
remote: Bundler will do a full resolve so native gems are handled properly.
remote: This may result in unexpected gem versions being used in your app.
remote: In rare occasions Bundler may not be able to resolve your dependencies at all.
remote: https://devcenter.heroku.com/articles/bundler-windows-gemfile
remote:
remote: -----> Installing dependencies using bundler 1.11.2
remote: Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4
remote: Fetching git://github.com/derekprior/momentjs-rails.git
remote: Fetching git://github.com/zpaulovics/datetimepicker-rails.git
remote: Cloning into 'bootstrap-datetimepicker'...
remote: Fetching gem metadata from https://rubygems.org/...........
remote: Fetching version metadata from https://rubygems.org/...
remote: Fetching dependency metadata from https://rubygems.org/..
remote: Resolving dependencies..........................................
remote: Installing json 1.8.3 with native extensions
remote: Installing rake 11.1.2
remote: Installing i18n 0.7.0
remote: Installing minitest 5.8.4
remote: Installing thread_safe 0.3.5
remote: Installing builder 3.2.2
remote: Installing erubis 2.7.0
remote: Installing mini_portile2 2.0.0
remote: Installing rack 1.6.4
remote: Installing mime-types 2.99.1
remote: Installing arel 6.0.3
remote: Installing execjs 2.6.0
remote: Installing bcrypt 3.1.11 with native extensions
remote: Installing bootstrap_form 2.3.0
remote: Installing sass 3.4.22
remote: Using bundler 1.11.2
remote: Installing thor 0.19.1
remote: Installing hike 1.2.3
remote: Installing multi_json 1.11.3
remote: Installing tilt 1.4.1
remote: Installing coffee-script-source 1.10.0
remote: Installing daemons 1.2.3
remote: Installing orm_adapter 0.5.0
remote: Installing eventmachine 1.0.9.1 with native extensions
remote: Installing unf_ext 0.0.7.2 with native extensions
remote: Installing fabrication 2.15.0
remote: Installing google_visualr 2.5.1
remote: Installing sexp_processor 4.7.0
remote: Installing hashie 3.4.3
remote: Installing json_pure 1.8.3
remote: Installing libv8 3.16.14.13
remote: Installing nested_form 0.3.2
remote: Installing netrc 0.11.0
remote: Installing pg 0.18.4 with native extensions
remote: Installing phony 2.15.21
remote: Installing rails_serve_static_assets 0.0.5
remote: Installing rails_stdout_logging 0.0.5
remote: Installing remotipart 1.2.1
remote: Installing safe_yaml 1.0.4
remote: Installing ref 2.0.0
remote: Installing faker 1.6.3
remote: Installing validates_email_format_of 1.6.3
remote: Installing tzinfo 1.2.2
remote: Installing nokogiri 1.6.7.2 with native extensions
remote: Installing rack-test 0.6.3
remote: Installing rack-protection 1.5.3
remote: Installing warden 1.2.6
remote: Installing mail 2.6.4
remote: Installing rdoc 4.2.2
remote: Installing autoprefixer-rails 6.3.6
remote: Installing uglifier 3.0.0
remote: Installing figaro 1.1.1
remote: Installing sprockets 2.12.4
remote: Installing haml 4.0.7
remote: Installing coffee-script 2.4.1
remote: Installing ruby_parser 3.8.1
remote: Installing unf 0.1.4
remote: Installing tropo-webapi-ruby 0.1.13
remote: Installing therubyracer 0.12.2 with native extensions
remote: Installing rails_12factor 0.0.3
remote: Installing activesupport 4.2.0
remote: Installing sinatra 1.4.7
remote: Installing sdoc 0.4.1
remote: Installing bootstrap-sass 3.3.6
remote: Installing domain_name 0.5.20160310
remote: Installing rails-deprecated_sanitizer 1.0.3
remote: Installing globalid 0.3.6
remote: Installing activemodel 4.2.0
remote: Installing clockwork 2.0.0
remote: Installing delayed_job 4.1.1
remote: Installing jbuilder 1.5.3
remote: Installing phony_rails 0.14.0
remote: Installing http-cookie 1.0.2
remote: Installing rails-dom-testing 1.0.7
remote: Installing loofah 2.0.3
remote: Installing html2haml 2.0.0
remote: Installing rack-pjax 0.8.0
remote: Installing activejob 4.2.0
remote: Installing activerecord 4.2.0
remote: Installing rest-client 1.8.0
remote: Installing rails-html-sanitizer 1.0.3
remote: Installing delayed_job_active_record 4.1.0
remote: Installing delayed_job_web 1.2.10
remote: Installing has_secure_token 1.0.0
remote: Installing actionview 4.2.0
remote: Installing actionpack 4.2.0
remote: Installing railties 4.2.0
remote: Installing actionmailer 4.2.0
remote: Installing sprockets-rails 2.0.1
remote: Installing kaminari 0.16.3
remote: Installing simple_form 3.1.1
remote: Installing jquery-rails 4.1.1
remote: Using momentjs-rails 2.11.1 from git://github.com/derekprior/momentjs-rails.git (at master#41e30d4)
remote: Installing coffee-rails 4.0.1
remote: Installing responders 2.1.2
remote: Installing font-awesome-rails 4.6.1.0
remote: Installing jquery-ui-rails 5.0.5
remote: Installing haml-rails 0.9.0
remote: Installing rails 4.2.0
remote: Installing turbolinks 2.5.3
remote: Using datetimepicker-rails 4.7.16 from git://github.com/zpaulovics/datetimepicker-rails.git (at master#36d21ce)
remote: Installing sass-rails 4.0.1
remote: Installing devise 4.0.1
remote: Installing browser-timezone-rails 0.0.8
remote: Installing fullcalendar-rails 2.6.1.0
remote: Installing dateslices 0.0.4
remote: Installing jquery-turbolinks 2.1.0
remote: Installing jquery-datatables-rails 3.3.0
remote: Installing rails_admin 0.8.1
remote: Bundle complete! 52 Gemfile dependencies, 109 gems now installed
remote: Gems in the groups development and test were not installed.
remote: Bundled gems are installed into ./vendor/bundle.
remote: Post-install message from rdoc:
remote: Depending on your version of ruby, you may need to install ruby rdoc/ri data:
remote: <= 1.8.6 : unsupported
remote: = 1.8.7 : gem install rdoc-data; rdoc-data --install
remote: = 1.9.1 : gem install rdoc-data; rdoc-data --install
remote: >= 1.9.2 : nothing to do! Yay!
remote: Post-install message from haml:
remote: HEADS UP! Haml 4.0 has many improvements, but also has changes that may break
remote: your application:
remote: * Support for Ruby 1.8.6 dropped
remote: * Support for Rails 2 dropped
remote: * Sass filter now always outputs <style> tags
remote: * Data attributes are now hyphenated, not underscored
remote: * html2haml utility moved to the html2haml gem
remote: * Textile and Maruku filters moved to the haml-contrib gem
remote: For more info see:
remote: http://rubydoc.info/github/haml/haml/file/CHANGELOG.md
remote: Post-install message from phony_rails:
remote: It now adds a '+' to the normalized number when it starts with a country number!
remote: Bundle completed (61.53s)
remote: Cleaning up the bundler cache.
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: rake aborted!
remote: NameError: uninitialized constant Sprockets::Rails::VERSION
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/bootstrap-sass-3.3.6/lib/bootstrap-sass/engine.rb:11:in `block in <class:Engine>'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/railtie.rb:194:in `public_send'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/railtie.rb:194:in `method_missing'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/config/environment.rb:5:in `<top (required)>'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:328:in `require_environment!'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:443:in `block in run_tasks_blocks'
remote: /tmp/build_ff86312346869b165736d37b1725f32c/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-2.0.1/lib/sprockets/rails/task.rb:54:in `block (2 levels) in define'
remote: Tasks: TOP => environment
remote: (See full trace by running task with --trace)
remote: !
remote: ! Precompiling assets failed.
remote: !
remote:
remote: ! Push rejected, failed to compile Ruby app
remote:
remote: Verifying deploy....
remote:
remote: ! Push rejected to fathom-reef-94288.
remote:
To https://git.heroku.com/fathomless-reef-94288.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/fathom-reef-94288.git'
I get the following error on performing rake assets:precompile on my local machine. This is the same error I get on heroku push.
rake assets:precompile
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
rake aborted!
NameError: uninitialized constant Sprockets::Rails::VERSION
/Users/azs/ror/maintr/config/environment.rb:5:in `<top (required)>'
Tasks: TOP => environment
(See full trace by running task with --trace)

Answer 1

It looks like you have an old version of sprockets-rails gem being installed. With Rails 4.2 you should be getting version 3 or later. But, in your case the bundler is installing version 2.0.1. Some version of the gem had this exact problem.
I guess the easiest way would be to generate a Gemfile.lock file on linux machine and force Heroku to use new version of the sprockets-rails gem.