Error: “compass:dist” Fatal error: spawn /usr/bin/compass ENOENT

Guys, I’m generating build my application with the grunt, it uses the
compass. I set some variables:

export GEM_PATH
=/usr/local/rvm/gems/ruby-2.1.2:/usr/local/rvm/gems/ruby-2.1.2@global
export PATH=$PATH:/usr/local/rvm/gems/ruby-2.1.2/bin
export PATH=$PATH:/usr/local/rvm/rubies/ruby-2.1.2/bin;
export PATH=$PATH:$GEM_PATH;
export PATH=$PATH:node_modules/grunt-cli/bin;

and perform the build grunt. The following Fatal error is :

4mRunning “compass:dist” (compass) task[24m 31mFatal error: spawn
/usr/bin/compass ENOENT[39m

Could someone help me with this problem?

Thank