I just can\'t figure out what is wrong with my setup with Susy. I am on OS X 10.7.4
I have followed along here: http://susy.oddbird.net/guides/getting-started/
Followed the solution here. Fixed. https://github.com/ericam/susy/issues/21
While it may not be "the correct answer" I had the same error, and realised I was trying to build with SASS, instead of using the Compass build system.
A bit silly I know, but hopefully if someone makes the same mistake, it could be helpful :D/
Try
gem install compass --pre
This worked for me
I was having this problem and found that my syntax was wrong in my config.rb file. The correct line would be require "susy"
but I had an equal sign between require and susy, which is wrong.
I hope that helps other noobs out there like myself.