title: Problem creating Rails 3 Engine
body: <p>I'm working on creating my first Rails 3 engine and I'm currently getting the following error message</p>
  
  <pre><code>is a Railtie/Engine and cannot be installed as plugin (RuntimeError)
  </code></pre>
  
  <p>To give you a bit more background I'm not doing the Engine as a gem, but I've place the Engine files in the vendor/plugins folder. I know there is an issue with loading when in the plugins folder, but I'm not clear on how to solve the problem.</p>
  
  <p>My rails/init.rb file in the Engine has the following code</p>
  
  <pre><code>require 'rails'
  
  module RailsApp
    module MyEngine
      class Engine &lt; Rails::Engine
  
        config.after_initialize do
          RailsApp::GameType.register do |game_type|
            game_type.name = "TreasureIsland"
            game_type.version = "0.1"
            game_type.thumbnail = "teasure_island.jpg"
          end
        end
      end
    end
  end
  </code></pre>
  
  <p>Suggestions?</p>