WebStorm LESS Filewatcher Could not find RubyGem less

WebStorm LESS Filewatcher Could not find RubyGem less

I'm getting this error trying to use the WebStorm LESS File Watcher
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:777:in `report_activate_error': Could not find RubyGem less (>= 0) (Gem::LoadError)
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:211:in `activate'
    from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:1056:in `gem'
    from /Users/me/.rvm/gems/ruby-1.9.3-p194/bin/lessc:18
    from /Users/me/.rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14
I'm running OSX Mountain Lion
How do I fix it?