yui-error.sh

rake aborted!
       compression failed
       (in /tmp/build_k9gleqb00cxc/app/assets/javascripts/application.coffee)
...
Tasks: TOP => assets:precompile:primary
       (See full trace by running task with --trace)
       Precompiling assets failed, enabling runtime asset compilation
       Injecting rails31_enable_runtime_asset_compilation
       Please see this article for troubleshooting help:
       http://devcenter.heroku.com/articles/rails31_heroku_cedar#troubleshooting
-----> Rails plugin injection