title: NameError: uninitialized constant Sprockets::Rails::VERSION on pushing to heroku
body: <p>I have an app which runs on local machine.</p>
  
  <p>Rails 4.2.0</p>
  
  <p>Ruby 2.2.3</p>
  
  <p>I am getting the following error on pushing to heroku.  The app runs on local machine.</p>
  
  <p>rake aborts with the error <code>NameError: uninitialized constant Sprockets::Rails::VERSION</code></p>
  
  <pre><code>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: -----&gt; Ruby app detected
  remote: -----&gt; Compiling Ruby/Rails
  remote: -----&gt; 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: -----&gt; 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:        &lt;= 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:        &gt;= 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 &lt;style&gt; 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: -----&gt; 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 &lt;class:Engine&gt;'
  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 `&lt;top (required)&gt;'
  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 =&gt; 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 -&gt; master (pre-receive hook declined)
  error: failed to push some refs to 'https://git.heroku.com/fathom-reef-94288.git'
  </code></pre>
  
  <p>I get the following error on performing <code>rake assets:precompile</code> on my local machine.  This is the same error I get on heroku push.</p>
  
  <pre><code>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 `&lt;top (required)&gt;'
  Tasks: TOP =&gt; environment
  (See full trace by running task with --trace)
  </code></pre>