I was stuck on this for a few hours, so hopefully this might help someone. If you are install ruby 2.0.0 with rvm, make sure you do rvm get head before doing rv

I was stuck on this for a few hours, so hopefully this might help someone. If you are install ruby 2.0.0 with rvm, make sure you do rvm get head before doing rvm install 2.0.0 or rvm reinstall 2.0.0