Working with mongoid error unitialized constant

[matiasfha]

I'm workind with mongoid (learning) and devise
i follow up the "how to" but when i try to test i have this error
uninitialized constant Devise::Twitter

This error occurred while loading the following files:
config/routes.rb

Mi routes.rb

Weird::Application.routes.draw do
root :to => "home#index"
devise_for :users do
match '/users/sign_in/twitter' => Devise::Twitter::Rack::Signin
match '/users/connect/twitter' => Devise::Twitter::Rack::Connect
end
resources :users, :only => :show
end

I can't find the problem.... ideas?