我正在尝试在laravel 5.7中创建多个登录，但出现了这个错误，有人能帮助我吗？

php artisan make:auth

'guards' => [
    'web' => [
        'driver' => 'session',
        'provider' => 'users',
    ],
    'admin' => [
        'driver' => 'session',
        'provider' => 'admins',
    ],
],

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

public function login(Request $request)
{
    // 使用"admin"认证驱动进行认证
    if (Auth::guard('admin')->attempt($credentials)) {
        // 认证成功
        return redirect()->intended('admin/dashboard');
    } else {
        // 认证失败
        return back()->withErrors(['message' => '认证失败']);
    }
}

@auth('admin')
    <!-- 只有通过"admin"认证驱动认证的用户才能看到这个内容 -->
@endauth