Gem.source_index is deprecated, use Specification. Should I re-install Gem or Rails?

Question

I\'m learning RoR on Ubuntu 11. Got the following message when I was trying to generate an app. Did I install something incorrectly?

$ rails generate control         


        

Answer 1

I tried "sudo gem update". After that, I don't see the message "Gem.source_index is deprecated, use Specification..." anymore. Yay!