Symfony2: No route found for “GET /lucky/number”

Question

I start the tutorial (as newbie) and everythings works fine till:

http://symfony.com/doc/current/book/page_creation.html#creating-a-page-route-and-controller at step

Answer 1

You actually don't extend Symfony Controller class. It should be class LuckyController extends Controller

// src/AppBundle/Controller/LuckyController.php 
namespace AppBundle\Controller; 

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route; 
use Symfony\Component\HttpFoundation\Response;

class LuckyController extends Controller {

     /** 
      * @Route("/lucky/number") 
      */ 
     public function numberAction() { 
         $number = rand(0, 100); 
         return new Response('Lucky number: '.$number.'');
     }

}

EDIT: after all, the problem in this question was not in extending controller, so ignore my answer.