Plugin Loading for Ruby on Rails has Changed.

I am tired of recreating the login system for Rails for each new project so using the RESTful Rails Authentication Tutorial I created a template project that I can use to create new projects. While adding in the OpenID Authentication component I started getting this error:

/Library/Ruby/Gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:376:in `new_constants_in': You have a nil object when you didn't expect it! (NoMethodError)

after I installed this OpenID plugin.

The problem occurs because Rails has changed the way that plugins are loaded. The default folder name was:

I renamed it to:

and everything started working again.