Laravel 5.2不返回错误数组

我想学习LAVERAL 5.2和在我的routes.php文件如下：

I am trying to learn Laveral 5.2 and have the following in my routes.php:

Route::group(['middleware' => ['web'] ], function()     {
Route::get('/', function () {
        return view('welcome');         });

Route::post('/signup', [ 'uses' =>'UserController@postSignUp',
    'as' => 'signup']);
Route::post('/signin', [    'uses' => 'UserController@postSignIn',
            'as' => 'signin']);

Route::get('/dashboard',['uses' =>'UserController@getDashboard',
            'as' => 'dashboard' ]);
});

在我的控制，我有一些验证：

In my Controller I have some validation:

$this->validate( $request, [
        'email' => 'required|email|unique:users',
        'first_name' =>'required|max:120',
        'password' => 'required|min:4'
        ]);

在我的登录屏幕我有以下几点：

and in my logon screen I have the following:

@if (count($errors) > 0 )
<div class="row">
     <div class="col-md-12">
    <ul>

        @foreach($errors->all() as $error)
            <li>{{ $error }}</li>
        @endforeach
    </ul>
    </div>
 </div>

错误数组似乎永远是空的。

The error array seems to always be empty.