ruby - compass cannot load such file sass_extemsions.rb -

ruby - compass cannot load such file sass_extemsions.rb -

i installed compass via gem install compass

c:\users\xxxxxx\desktop\project\webfeature>gem install compass fetching: sass-3.2.19.gem (100%) installed sass-3.2.19 fetching: compass-0.12.6.gem (100%) installed compass-0.12.6 parsing documentation sass-3.2.19 installing ri documentation sass-3.2.19 parsing documentation compass-0.12.6 installing ri documentation compass-0.12.6 2 gems installed

looks fine, doesn´t it? when seek run via gruntjs "grunt dev" not work, says cannot load file sass_extensions.rb, although there ...

running "compass:dev" (compass) task loaderror on line ["55"] of c: cannot load such file -- src/sass/libs/sass_extensions.rb

what wrong?

ruby sass gruntjs compass-sass