Stack trace for localhost:3000/admin after using activeadmin gem

activeadmin_login_stacktrace

Started GET "/admin" for 127.0.0.1 at 2013-02-26 00:48:33 +0530

ActionController::RoutingError (wrong constant name Admin/dashboardController):
  activesupport (3.2.6) lib/active_support/inflector/methods.rb:229:in `const_defined?'
  activesupport (3.2.6) lib/active_support/inflector/methods.rb:229:in `block in constantize'
  activesupport (3.2.6) lib/active_support/inflector/methods.rb:228:in `each'
  activesupport (3.2.6) lib/active_support/inflector/methods.rb:228:in `constantize'
  activesupport (3.2.6) lib/active_support/dependencies.rb:554:in `get'
  actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:69:in `controller_reference'
  actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:54:in `controller'
  actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:32:in `call'
  journey (1.0.4) lib/journey/router.rb:68:in `block in call'
  journey (1.0.4) lib/journey/router.rb:56:in `each'
  journey (1.0.4) lib/journey/router.rb:56:in `call'
  actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:600:in `call'
  warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.1) lib/warden/manager.rb:34:in `catch'
  warden (1.2.1) lib/warden/manager.rb:34:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
  rack (1.4.1) lib/rack/etag.rb:23:in `call'
  rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/head.rb:14:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call'
  rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
  rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call'
  activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call'
  activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__2094860160062473347__call__1594928359843298061__callbacks'
  activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/reloader.rb:65:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app'
  railties (3.2.6) lib/rails/rack/logger.rb:16:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.1) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.1) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.6) lib/action_dispatch/middleware/static.rb:62:in `call'
  railties (3.2.6) lib/rails/engine.rb:479:in `call'
  railties (3.2.6) lib/rails/application.rb:220:in `call'
  rack (1.4.1) lib/rack/content_length.rb:14:in `call'
  railties (3.2.6) lib/rails/rack/log_tailer.rb:17:in `call'
  rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
  /Users/achakrab/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
  /Users/achakrab/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
  /Users/achakrab/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'


  Rendered /Users/achakrab/.rvm/gems/ruby-1.9.3-p194@193/gems/actionpack-3.2.6/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (1.0ms)

admin_user.rb

ActiveAdmin.register AdminUser do     
  index do                            
    column :email                     
    column :current_sign_in_at        
    column :last_sign_in_at           
    column :sign_in_count             
    default_actions                   
  end                                 

  filter :email                       

  form do |f|                         
    f.inputs "Admin Details" do       
      f.input :email                  
      f.input :password               
      f.input :password_confirmation  
    end                               
    f.actions                         
  end                                 
end                                   

dashboard.rb

ActiveAdmin.register_page "Dashboard" do

  menu :priority => 1, :label => proc{ I18n.t("active_admin.dashboard") }

  content :title => proc{ I18n.t("active_admin.dashboard") } do
    div :class => "blank_slate_container", :id => "dashboard_default_message" do
      span :class => "blank_slate" do
        span I18n.t("active_admin.dashboard_welcome.welcome")
        small I18n.t("active_admin.dashboard_welcome.call_to_action")
      end
    end

    # Here is an example of a simple dashboard with columns and panels.
    #
    # columns do
    #   column do
    #     panel "Recent Posts" do
    #       ul do
    #         Post.recent(5).map do |post|
    #           li link_to(post.title, admin_post_path(post))
    #         end
    #       end
    #     end
    #   end

    #   column do
    #     panel "Info" do
    #       para "Welcome to ActiveAdmin."
    #     end
    #   end
    # end
  end # content
end