When rake spec doesn't work

I mentioned over a week ago that rake rspec wasn't working for me. After looking around for a bit today, I found a solution.

Something in the RSpec chain (maybe RSpec itself) requires version 1.2.3 of the test-unit gem. However, gem install test-unit will install version 2.0.3 by default. You can have both versions of the gem installed. However, having both versions causes the rake task to not work properly. Removing the 2.0.3 version of the gem corrects the issue and the rake task will work normally.