php - Auth::guard()がlaravel 5.2で機能しない

Question

config/auth.php

<?php
return [
'defaults' => [
    'guard' => 'user',
    'passwords' => 'user',
],
'guards' => [
    'user' => [
        'driver' => 'session',
        'provider' => 'user',
    ],
    'admin' => [
        'driver' => 'session',
        'provider' => 'admin',
    ],
],
'providers' => [
    'user' => [
        'driver' => 'eloquent',
        'model' => 'App\User',
    ],
    'admin' => [
        'driver' => 'eloquent',
        'model' => 'App\Admin',
    ],
],
'passwords' => [
    'user' => [
        'provider' => 'user',
        'email' => 'auth.emails.password',
        'table' => 'password_resets',
        'expire' => 60,
    ],
    'admin' => [
        'provider' => 'admin',
        'email' => 'auth.emails.password',
        'table' => 'password_resets',
        'expire' => 60,
    ]
]
];
?>

ルート.php

Route::get('/test1', function() {
   return Auth::guard('admin');
});

Route::get('/test2', function() {
   return Auth::guard('user');
});

ここに私が得ているエラーがあります

Illuminate\Auth\AuthManager::createDriver() の引数 1 がありません。C:\xampp\htdocs\storage\framework\compiled.php の 11193 行で呼び出され、定義されています。

どうしたの ？