I\'m using Ruby version 1.9.3 at the moment (although I get the same issue with Ruby 2.0.0). On Windows 7 64-bit. I\'m following \'The Cucumber Book\' and got stuck at the
Whenever you install a new gem you need to update the bundle (as @zwolfe pointed out). Hence, run:
bundle update
Right after you should be able to run your Ruby scripts either using simply:
ruby or bundle exec ruby
ruby
bundle exec ruby