Laravel 5.2不显示寄存器中的错误

我在web middleware中添加我的路由。当我在寄存器中发布null值时，它不会显示验证错误。但当我从路由中删除web middleware时，它可以正常工作。

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

它不起作用，但

Route::auth();

工作正常

Kernel.php

    protected $middleware = [
    'Illuminate'Foundation'Http'Middleware'CheckForMaintenanceMode::class,
    'Illuminate'Session'Middleware'StartSession::class,
    'Illuminate'View'Middleware'ShareErrorsFromSession::class,
      'App'Http'Middleware'Authenticate::class,   ### redirect if Authenticate
    'App'Http'Middleware'VerifyCsrfToken::class,
];
/**
 * The application's route middleware groups.
 *
 * @var array
 */
protected $middlewareGroups = [
    'web' => [
        'App'Http'Middleware'EncryptCookies::class,
        'Illuminate'Cookie'Middleware'AddQueuedCookiesToResponse::class,
        'Illuminate'Session'Middleware'StartSession::class,
        'Illuminate'View'Middleware'ShareErrorsFromSession::class,
      //  'App'Http'Middleware'VerifyCsrfToken::class,
    ],