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Using the Ruby on Rails tutorial for OSX here: http://ruby.railstutorial.org/book/ruby-on-rails-tutorial
It states to install the rails via “$ gem install rails -v 3.2.3”, and when I do that I get the error
Error installing rails:
invalid gem format for /Users//.rvm/gems/ruby-1.9.3-p194@rails3tutorial2ndEd/cache/railties-3.2.3.gem
Sounds like your gem dependencies got messed up. Reinstall all your gems with this command: