Error while defining routes in laravel 5

Routes.php

 <?php

Route::get('/user/register', 'RegistrationController@registerUser');

//Route::get('/index', 'HomeController@index');

Route::get('/', 'RegistrationController@registration');

?>

RegistrationController.php

<?php namespace App\Http\Controllers;

class RegistrationController extends controller{
    public function registration(){
        return view('index');
    }

    public function registerUser(){
        var_dump(1212);
        die;
    }
}

The route root("/") correctly renders my page.

However when I try "/user/register" => I expected to get a dump of 1212 and blank screen. Here is what I got.

How can I fix this problem ?

Best regards, Manish

via Chebli Mohamed