Ruby on Rails

I installed RVM and am getting a kinds of errors. I have managed to get
most things back to normal but I get this error now in one of my apps.

/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/application.rb:63:in
`inherited': You cannot have more than one Rails::Application
(RuntimeError)

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