'sass' in a non thread-safe way

Question

I\'m getting these warnings when trying to use sass in Rails 3.1 rc1.

WARN: tilt autoloading \'sass\' in a non thread-safe way; explicit requir         


        

Answer 1

I had the same problem, and was able to solve it by compiling assets locally before pushing to Heroku as mentioned in the article Rails 3.1+ Asset Pipeline on Heroku Cedar

RAILS_ENV=production bundle exec rake assets:precompile

I also tried Itecedors suggestion which also worked:

While precompiling assets, in Rails 3.1.1 and up, you can prevent initializing
your application and connecting to the database by ensuring that the following 
line is in your > config/application.rb:

config.assets.initialize_on_precompile = false