Looks like you're probably running it with Ruby 1.8, and it's using the Ruby 1.9 Hash syntax. Try to run it with 1.9, either through something like RVM, rbenv o

Looks like you're probably running it with Ruby 1.8, and it's using the Ruby 1.9 Hash syntax. Try to run it with 1.9, either through something like RVM, rbenv or chruby, or with any other number of distribution installers.