Error in controller Namespace of Route --Rails

I’m trying to work with controller Namespace of Route.
i’m doing with instructions in :
http://guides.rubyonrails.org/routing.html
and here is code of my Route:

namespace :admin do
resources :users
end

I created admin folder and move controller users_controller to it.
And I edit code in users_controller same as :

class Admin::UsersController < ApplicationController
But when I ran project and using Url:

http://localhost:3000/admin/users/new
and have error:

Missing template admin/users/new, application/new with {:locale=>[:en],
:formats=>[:html], :handlers=>[:erb, :builder, :coffee]}.
Who can help me this problem ? Thanks…

The error listed is basically the problem, it can’t find a template for
the
new action inside admin/users or application/new. Do you have an
admin/users folder?