"Missing...required gems..." but the gem shows up in Settings Follow

My "Settings, Ruby SDK and Gems" indicates that I have installed rspec-rails 1.3.3 but the trying to Debug my RSpec tests reports that the debugger can't find it...

DEPRECATION WARNING: Kernel#returning has been deprecated in favor of Object#tap. (called from enable_activerecord at /Users/bob/.gem/ruby/1.8/gems/will_paginate-2.3.12/lib/will_paginate.rb:39)
Missing these required gems:
  rspec-rails  >= 1.3.3

What's up with that?

Rails itself runs fine, its just the bloody tests.  As always, any help is greatly appreciated.

Bob