Warning: LoadError on line ["179"] of /Library/Ruby/Gems/2.0.0/gems/compass-core-1.0.1/lib/compass/configuration/data.rb: cannot load such file -- susy

You’re here because you’re probably seeing something that resembles the above. First off make sure your compass-core is 1.x.x or greater. Susy 2.x requires compass to be at least 1.x. (Need help?, see my previous post).

Next up, make sure it your gemfile (usually located at your project’s root) has  gem 'susy' on its own line.

Lastly examine your grunt file, if you’re using compass, you’ll only need to use the require: susy command (see more at the official docs). 

Hopefully this helps in your gridding adventures.