Php laravel 5.6多身份验证问题

在我的项目中进行多重身份验证后出现异常：

传递给Illumb\Auth\SessionGuard:：\uuu construct（）的参数2必须是Illumb\Contracts\Auth\UserProvider的实例，给定为空，在D:\xaamp\htdocs\laravelapi\vendor\laravel\framework\src\illumb\Auth\AuthManager.php中调用

这是一张照片：

我不明白，请帮忙，谢谢

下面是auth.php配置文件

    'defaults' => [
    'guard' => 'web',
    'passwords' => 'user',
], 'guards' => [
    'web' => [
        'driver' => 'session',
        'provider' => 'users',
    ],

    'api' => [
        'driver' => 'token',
        'provider' => 'users',
    ],
    'admin' => [
        'driver' => 'session',
        'provider' => 'admins',
    ],
    'library' => [
        'driver' => 'session',
        'provider' => 'libraries',
    ],

],'providers' => [
    'users' => [
        'driver' => 'eloquent',
        'model' => App\User::class,
    ],
    'admins' => [
        'driver' => 'eloquent',
        'model' => App\Admin::class,
    ],
    'libraries' => [
        'driver' => 'eloquent',
        'model' => App\Library::class,
    ],

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我为每个guard loginController和登录视图制作了

你能提供如何访问auth吗？我在问题中添加了auth.php文件