Fails to push to Heroku: Sprockets::FileNotFound: could not find application.css

Question

I used to be able to push to Heroku without problems. After making some changes, which seem unrelated to my problem, it fails to push to Heroku. On git push heroku I get the error:

...
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        rake aborted!
remote:        Sprockets::FileNotFound: could not find file: /tmp/build_c657fd7***e8c75a3/app/assets/stylesheets/application.css
remote:        /tmp/build_790d1e***cab4395/vendor/bundle/ruby/2.2.0/gems/sprockets-3.3.3/lib/sprockets/loader.rb:103:in `load_from_unloaded'
remote:        /tmp/build_790d1***ab4395/vendor/bundle/ruby/2.2.0/gems/sprockets-3.3.3/lib/sprockets/loader.rb:60:in `block in load'
...
remote:  !     Precompiling assets failed.
remote:  !     Push rejected, failed to compile Ruby app
remote:  !     Push rejected to ***.

application.css does exist in my development environment and includes:

 *= require_self
 *= require universal
 *= require bootstrap-datepicker3
 *= require menu_header
 *= require table
 *= require wice_grid
 *= require_tree .

Does anyone have an idea what might be causing the problems and what to do about it? If I can resolve it through resetting something, then that's an option since the application isn't live yet so there's no risk of losing data.

Answer 1

I contacted Heroku and they described it as a slug cache issue. Clearing the cache using purge_cache solved it.

Answer 2

According to researches there may be some options: 1) Just set config.serve_static_assets to true 2) make a rake assets:precompile before pushing , also see if you got any errors 3) .git file corrupted in git directory