title: Installed activeadmin messing with my routes incompatibility issue
body: <p>I just ran <code>rails g active_admin:install</code>, the standard is it generated and installed a bunch of files on my rails application. When I run that I am getting this </p>
  
  <pre><code>/Users/judyngai/.rvm/gems/ruby-2.0.0-p195/gems/actionpack-4.0.0/lib/action_dispatch/routing/route_set.rb:409:in `add_route': Invalid route name, already in use: 'admin_root'  (ArgumentError)
  You may have defined two routes with the same name using the `:as` option, or you may be overriding a route already defined by a resource with the same naming. For the latter, you can restrict the routes created with `resources` as explained here: 
  http://guides.rubyonrails.org/routing.html#restricting-the-routes-created
  </code></pre>
  
  <p>this is now what my routes look like</p>
  
  <pre><code>Lintong::Application.routes.draw do
    devise_for :admin_users, ActiveAdmin::Devise.config
    ActiveAdmin.routes(self)
    #get 'signup', to: 'students#signup'
  
  
    root :to =&gt; 'students#signup'
  
    resources :students #may not be necessary 
  
    devise_for :students
    ActiveAdmin.routes(self)
    # The priority is based upon order of creation: first created -&gt; highest priority.
    # See how all your routes lay out with "rake routes".
  
    # You can have the root of your site routed with "root"
  
    # Example of regular route:
    #   get 'products/:id' =&gt; 'catalog#view'
  
    # Example of named route that can be invoked with purchase_url(id: product.id)
    #   get 'products/:id/purchase' =&gt; 'catalog#purchase', as: :purchase
  
    # Example resource route (maps HTTP verbs to controller actions automatically):
    #   resources :products
  
    # Example resource route with options:
    #   resources :products do
    #     member do
    #       get 'short'
    #       post 'toggle'
    #     end
    #
    #     collection do
    #       get 'sold'
    #     end
    #   end
  
    # Example resource route with sub-resources:
    #   resources :products do
    #     resources :comments, :sales
    #     resource :seller
    #   end
  
    # Example resource route with more complex sub-resources:
    #   resources :products do
    #     resources :comments
    #     resources :sales do
    #       get 'recent', on: :collection
    #     end
    #   end
  
    # Example resource route with concerns:
    #   concern :toggleable do
    #     post 'toggle'
    #   end
    #   resources :posts, concerns: :toggleable
    #   resources :photos, concerns: :toggleable
  
    # Example resource route within a namespace:
    #   namespace :admin do
    #     # Directs /admin/products/* to Admin::ProductsController
    #     # (app/controllers/admin/products_controller.rb)
    #     resources :products
    #   end
  end
  </code></pre>
  
  <p>I can not do <code>rails s</code> </p>
  
  <p>I am getting this , the same error. I am not so familiar with routes and will be reading up on it. I hope someone can explain to me what I did wrong and how to solve this. </p>
  
  <pre><code>/Users/judyngai/.rvm/gems/ruby-2.0.0-p195/gems/actionpack-4.0.0/lib/action_dispatch/routing/route_set.rb:409:in `add_route': Invalid route name, already in use: 'admin_root'  (ArgumentError)
  You may have defined two routes with the same name using the `:as` option, or you may be overriding a route already defined by a resource with the same naming. For the latter, you can restrict the routes created with `resources` as explained here: 
  http://guides.rubyonrails.org/routing.html#restricting-the-routes-created
  </code></pre>