Gem not working in ruby 1.9.3

[cmckni3]

I can't get the gem to work for some reason with my rails app (rails 3.2.6).The latest version (0.7.2) is installed but I get the errors I describe in the stackoverflow question below

http://stackoverflow.com/questions/11424817/ruby-on-rails-github-gem-error#comment15071597_11424817