Class App\Http\Controllers\AuthController does not exist Laravel 5.2

My whole application, made in Laravel 5.2, is working perfectly fine but when i tried to get list of routes through following command:

php artisan route:list

It shows me following error:

[ReflectionException] Class App\Http\Controllers\AuthController does not exist

i tried to add namespace aswell:

Route::group(['middleware' => ['web'], 'namespace' => 'Auth'], function () {
    Route::auth();
});

then it shows me following error:

[ReflectionException]
Class App\Http\Controllers\Auth\Auth\AuthController does not exist

My routes file is:

Route::group(['middleware' => ['web'], 'namespace'=>'Auth'], function() {
     Route::auth(); 
});

Update: content of Router.php

public function auth()
{
    // Authentication Routes...
    $this->get('login', 'Auth\AuthController@showLoginForm');
    $this->post('login', 'Auth\AuthController@login');
    $this->get('logout', 'Auth\AuthController@logout');

    // Registration Routes...
    $this->get('register', 'Auth\AuthController@showRegistrationForm');
    $this->post('register', 'Auth\AuthController@register');

    // Password Reset Routes...
    $this->get('password/reset/{token?}', 'Auth\PasswordController@showResetForm');
    $this->post('password/email', 'Auth\PasswordController@sendResetLinkEmail');
    $this->post('password/reset', 'Auth\PasswordController@reset');
}

Please help! Thanks