Phusion error: undefined method `has?' for Sass::Util:Module

After more digging around, I found a similar problem. I fixed this one by changing the gem file to:

gem 'compass-rails', github: 'Compass/compass-rails'

Then:

rm gemfile.lock
bundle

It seems that the issue can be found in compass-rails 2.0.0. The version 3.0.2 seems to fix this issues. So a possible solution is :

# Gemfile
gem 'compass-rails', '~> 3.0.2'

Then bundle update compass-rails

This avoids targeting the compass-rails git master branch in favor of an actual release.