you just need to remove any old version of sass and compass like so :
sudo gem uninstall sass, sudo gem uninstall compass
ex:
$ sudo gem uninstall sass
Select gem to uninstall:
1. sass-3.2.19
2. sass-3.3.5
3. All versions
and just keep only the newest version of sass and compass and codekit will work like charm :)
I solved my Problem with this