Установил SASS и Compass.
В config.rb прописал:
require 'compass/import-once/activate'
# Require any additional compass plugins here.
# Set this to the root of your project when deployed:
http_path = "/"
css_dir = "css"
sass_dir = "sass"
images_dir = "img"
javascripts_dir = "js"
Вот настройки file watcher
SCSS
Compass SCSS
Compass в проект подключил
при компиляции выдает ошибку: