Heroku: Error encountered while saving cache

Question

Everything works fine locally, but when pushing to Heroku:

   Warning. Error encountered while saving cache /tmp/build_1b5c442a-d24e-4f80-9755-a0bd15d7f029/t         


        

Answer 1

This is a known bug in Sass 3.3.0, the Sprockets importer is unserialized and so un-cacheable causing this error. For the bug report see this. Without the caching, Sass compiles excruciatingly slow which leads to the timeout on heroku servers.