title: Precompiling assets failed ExecJS::ProgramError: Unexpected token: operator (=) (line: 10770 , col: 0, pos: 300859)
body: <p>I am having issues pushing my rails project to heroku. I get a "Precompiling assets failed" message . I am new to programming and new to ruby on rails. I really need some help. Here is the text from my command line.</p>
  
  <pre><code> $ git push heroku master
  Counting objects: 76, done.
  Compressing objects: 100% (63/63), done.
  Writing objects: 100% (76/76), 27.38 KiB | 11.00 KiB/s, done.
  Total 76 (delta 4), reused 0 (delta 0)
  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-2.0.0
  remote: ###### WARNING:
  remote:        Removing `Gemfile.lock` because it was generated on Windows.
  remote:        Bundler will do a full resolve so native gems are handled properl
  y.
  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 depende
  ncies at all.
  remote:        https://devcenter.heroku.com/articles/bundler-windows-gemfile
  remote:
  remote: -----&gt; Installing dependencies using 1.9.7
  remote:        Running: bundle install --without development:test --path vendor/
  bundle --binstubs vendor/bundle/bin -j4
  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:        Rubygems 2.0.14 is not threadsafe, so your gems must be installed
   one at a time. Upgrade to Rubygems 2.1.0 or higher to enable parallel gem insta
  llation.
  remote:        Installing rake 10.4.2
  remote:        Installing i18n 0.7.0
  remote:        Installing multi_json 1.11.0
  remote:        Installing activesupport 3.2.21
  remote:        Installing builder 3.0.4
  remote:        Installing activemodel 3.2.21
  remote:        Installing erubis 2.7.0
  remote:        Installing journey 1.0.4
  remote:        Installing rack 1.4.5
  remote:        Installing rack-cache 1.2
  remote:        Installing rack-test 0.6.3
  remote:        Installing hike 1.2.3
  remote:        Installing tilt 1.4.1
  remote:        Installing sprockets 2.2.3
  remote:        Installing actionpack 3.2.21
  remote:        Installing mime-types 1.25.1
  remote:        Installing polyglot 0.3.5
  remote:        Installing treetop 1.4.15
  remote:        Installing mail 2.5.4
  remote:        Installing actionmailer 3.2.21
  remote:        Installing arel 3.0.3
  remote:        Installing tzinfo 0.3.44
  remote:        Installing activerecord 3.2.21
  remote:        Installing activeresource 3.2.21
  remote:        Using bundler 1.9.7
  remote:        Installing coffee-script-source 1.9.1.1
  remote:        Installing execjs 2.5.2
  remote:        Installing coffee-script 2.4.1
  remote:        Installing rack-ssl 1.3.4
  remote:        Installing json 1.8.2
  remote:        Installing rdoc 3.12.2
  remote:        Installing thor 0.19.1
  remote:        Installing railties 3.2.21
  remote:        Installing coffee-rails 3.2.2
  remote:        Installing jquery-rails 3.1.2
  remote:        Installing pg 0.18.2
  remote:        Installing rails 3.2.21
  remote:        Installing sass 3.4.14
  remote:        Installing sass-rails 3.2.6
  remote:        Installing uglifier 2.7.1
  remote:        Bundle complete! 6 Gemfile dependencies, 40 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 r
  doc/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:        Bundle completed (54.39s)
  remote:        Cleaning up the bundler cache.
  remote: -----&gt; Writing config/database.yml to read from DATABASE_URL
  remote: -----&gt; Preparing app for Rails asset pipeline
  remote:        Running: rake assets:precompile
  remote:        DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/p
  lugins! Support for these plugins will be removed in Rails 4.0. Move them out an
  d bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and
   config/initializers/myplugin.rb. See the release notes for more on this: http:/
  /weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from
   &lt;top (required)&gt; at /tmp/build_7f6590528210ec3b45a43e69c0119446/Rakefile:7)
  remote:        DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/p
  lugins! Support for these plugins will be removed in Rails 4.0. Move them out an
  d bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and
   config/initializers/myplugin.rb. See the release notes for more on this: http:/
  /weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from
   &lt;top (required)&gt; at /tmp/build_7f6590528210ec3b45a43e69c0119446/Rakefile:7)
  remote:        rake aborted!
  remote:        ExecJS::ProgramError: Unexpected token: operator (=) (line: 10770
  , col: 0, pos: 300859)
  remote:        Error
  remote:        at new JS_Parse_Error (/tmp/execjs20150523-743-1p3uckwjs:2359:106
  23)
  remote:        at js_error (/tmp/execjs20150523-743-1p3uckwjs:2359:10842)
  remote:        at croak (/tmp/execjs20150523-743-1p3uckwjs:2359:19086)
  remote:        at token_error (/tmp/execjs20150523-743-1p3uckwjs:2359:19223)
  remote:        at unexpected (/tmp/execjs20150523-743-1p3uckwjs:2359:19311)
  remote:        at expr_atom (/tmp/execjs20150523-743-1p3uckwjs:2359:27526)
  remote:        at maybe_unary (/tmp/execjs20150523-743-1p3uckwjs:2359:30019)
  remote:        at expr_ops (/tmp/execjs20150523-743-1p3uckwjs:2359:30777)
  remote:        at maybe_conditional (/tmp/execjs20150523-743-1p3uckwjs:2359:3086
  9)
  remote:        at maybe_assign (/tmp/execjs20150523-743-1p3uckwjs:2359:31312)
  remote:        at expression (/tmp/execjs20150523-743-1p3uckwjs:2359:31625)
  remote:        at simple_statement (/tmp/execjs20150523-743-1p3uckwjs:2359:22563
  )
  remote:        at /tmp/execjs20150523-743-1p3uckwjs:2359:20468
  remote:        (in /tmp/build_7f6590528210ec3b45a43e69c0119446/app/assets/javasc
  ripts/application.js)new JS_Parse_Error ((execjs):2359:10623)
  remote:        js_error ((execjs):2359:10842)
  remote:        croak ((execjs):2359:19086)
  remote:        token_error ((execjs):2359:19223)
  remote:        unexpected ((execjs):2359:19311)
  remote:        expr_atom ((execjs):2359:27526)
  remote:        maybe_unary ((execjs):2359:30019)
  remote:        expr_ops ((execjs):2359:30777)
  remote:        maybe_conditional ((execjs):2359:30869)
  remote:        maybe_assign ((execjs):2359:31312)
  remote:        expression ((execjs):2359:31625)
  remote:        simple_statement ((execjs):2359:22563)
  remote:        (execjs):2359:20468
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/execjs-2.5.2/lib/execjs/external_runtime.rb:39:in `exec'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/execjs-2.5.2/lib/execjs/external_runtime.rb:21:in `eval'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/execjs-2.5.2/lib/execjs/external_runtime.rb:46:in `call'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/uglifier-2.7.1/lib/uglifier.rb:212:in `run_uglifyjs'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/uglifier-2.7.1/lib/uglifier.rb:179:in `compile'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/compressors.rb:74:in `compress'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/processing.rb:265:in `block in js_compres
  sor='
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/processor.rb:29:in `call'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/processor.rb:29:in `evaluate'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/tilt-1.4.1/lib/tilt/template.rb:103:in `render'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/context.rb:193:in `block in evaluate'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/context.rb:190:in `each'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/context.rb:190:in `evaluate'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/bundled_asset.rb:26:in `initialize'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:252:in `new'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:252:in `build_asset'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/index.rb:93:in `block in build_asset'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/caching.rb:19:in `cache_asset'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/index.rb:92:in `build_asset'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:169:in `find_asset'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/index.rb:60:in `find_asset'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/static_compiler.rb:19:in `block in comp
  ile'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:219:in `block in each_logical_pat
  h'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:206:in `block (2 levels) in each_
  file'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:196:in `each'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:196:in `each_entry'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:204:in `block in each_file'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:203:in `each'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:203:in `each_file'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/sprockets-2.2.3/lib/sprockets/base.rb:217:in `each_logical_path'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/static_compiler.rb:18:in `compile'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/assets.rake:56:in `internal_precompile'
  
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/assets.rake:70:in `block (3 levels) in
  &lt;top (required)&gt;'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/assets.rake:60:in `block (3 levels) in
  &lt;top (required)&gt;'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/assets.rake:23:in `invoke_or_reboot_rak
  e_task'
  remote:        /tmp/build_7f6590528210ec3b45a43e69c0119446/vendor/bundle/ruby/2.
  0.0/gems/actionpack-3.2.21/lib/sprockets/assets.rake:29:in `block (2 levels) in
  &lt;top (required)&gt;'
  remote:        Tasks: TOP =&gt; assets:precompile:primary
  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 whispering-chamber-4883.
  remote:
  To https://git.heroku.com/whispering-chamber-4883.git
   ! [remote rejected] master -&gt; master (pre-receive hook declined)
  error: failed to push some refs to 'https://git.heroku.com/whispering-chamber-48
  83.git'
  </code></pre>
  
  <p>Thanks.</p>