Why does "compass watch" say it cannot load sass/script/node (LoadError)?

Uninstall sass and reinstall it with the following:

gem uninstall sassgem install sass

There was an issue with my installation of sass and doing this fixed the issue.

ruby rubygems compass-sass

In my case, Sass version was not compatible with Compass.

FIX :

uninstall Sass AND Compass
```
gem uninstall compassgem uninstall sass
```
install Compass who will install a compatible Sass engine automaticaly
```
gem install compass
```

ruby rubygems compass-sass

This combination is finally working for me to bring Compass and SASS Sourcemaps together:

Gemfile

gem 'sass', '3.3.0.alpha.149'gem 'compass', '0.12.2'gem 'compass-sourcemaps', "~> 0.12.2.sourcemaps.57a186c"

sass_options = {:sourcemap => true}