我正在尝试为用户和管理员实施laravel 5.2多重身份验证 . 但是身份验证用户提供程序[]未定义错误

我已经按照这个问题回答了Can anyone explain Laravel 5.2 Multi Auth with example

使用admin和user表实现多个表身份验证 . 我已完成上述所有步骤，例如添加admin作为提供者，在config / auth.php中保护，为admin创建auth控制器，为admin创建中间件 . 但在我运行我的项目后，它说没有定义身份验证用户提供程序[] . 但是我在config / auth.php中定义了admin和user的提供者 . 我使用了不同的登录和注册表单，用户和admin的控制器 . 当用户或管理员登录时，我想在导航栏中显示用户或管理员名称 . 为此，我使用了laravel docs（主文件html附件中的代码）中所述的auth guard . 我已经坚持这个错误6天了 . 我急切地需要你的帮助 . 这是我的附件config / auth.php

return [



'defaults' => [
    'guard' => 'web',
    'passwords' => 'users',
],



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

    'api' => [
        'driver' => 'token',
        'provider' => 'users',
    ],
    'user' =>[
    'driver' => 'session',
    'provider' => 'user',
    ],
    'admin' => [
        'driver' => 'session',
        'provider' => 'admin',
    ],
],



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

    // 'users' => [
    //     'driver' => 'database',
    //     'table' => 'users',
    // ],
],



'passwords' => [
    'users' => [
        'provider' => 'users',
        'email' => 'auth.emails.password',
        'table' => 'password_resets',
        'expire' => 60,
    ],
        'admins' => [
        'provider' => 'admin',
        'email' => 'auth.emails.password',
        'table' => 'password_resets',
        'expire' => 60,
    ],
],

];

routes.php文件

<?php


Route::get('/', function () {
    return view('welcome');
});

Route::auth();

Route::get('/home', 'HomeController@index');

Route::group(['middleware' => ['web']], function () {
    //Login Routes...
    Route::get('/admin/login','AdminAuth\AuthController@showLoginForm');
    Route::post('/admin/login','AdminAuth\AuthController@login');
    Route::get('/admin/logout','AdminAuth\AuthController@logout');

    // Registration Routes...
    Route::get('admin/register', 'AdminAuth\AuthController@showRegistrationForm');
    Route::post('admin/register', 'AdminAuth\AuthController@register');

    Route::get('/admin', 'AdminController@index');

});

应用程序/ HTTP /控制器/ AdminAuth / AuthController.php

namespace App\Http\Controllers\AdminAuth;

use App\Admin;
use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;

class AuthController extends Controller
{


    use AuthenticatesAndRegistersUsers, ThrottlesLogins;


    protected $redirectTo = '/admin';
    protected $guard = 'admin';
    //protected $redirectTo = '/';

    /**
     * Create a new authentication controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware($this->guestMiddleware(), ['except' => 'logout']);
    }


    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => 'required|max:255',
            'email' => 'required|email|max:255|unique:users',
            'password' => 'required|min:6|confirmed',
        ]);
    }

            protected function create(array $data)
    {
        return Admin::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => bcrypt($data['password']),
        ]);
    }
    public function showLoginForm()
    {
        if (view()->exists('auth.authenticate')) {
            return view('auth.authenticate');
        }

        return view('admin.auth.login');
    }
    public function showRegistrationForm()
    {
        return view('admin.auth.register');
    } 
}

admin.php的

<?php

namespace App;

use Illuminate\Foundation\Auth\User as Authenticatable;


class Admin extends Authenticatable
{

    protected $fillable = [
        'name', 'email', 'password',
    ];


    protected $hidden = [
        'password', 'remember_token',
    ];
}

AdminController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Http\Requests;
use Illuminate\Contracts\View\View;

class AdminController extends Controller
{

    protected $guard =  'admin';

     public function __construct(){
        $this->middleware('admin');
    }
    public function index(){
        return view('admin.home');
    }

}

管理中间件

<?php

namespace App\Http\Middleware;

use Closure;

class RedirectIfNotAdmin
{

    public function handle($request, Closure $next, $guard = 'admin')
    {
        if (!Auth::guard($guard)->check()) {
            return redirect('/');
        }

        return $next($request);
    }
}

显示管理员的主布局

<!-- Authentication Links -->
                    @if (Auth::guard('admin')->guest())
                        <li><a href="{{ url('/login') }}">Login</a></li>
                        <li><a href="{{ url('/register') }}">Register</a></li>
                    @else
                        <li class="dropdown">
                            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
                                {{ Auth::guard('admin')->user()->name }} <span class="caret"></span>
                            </a>

                            <ul class="dropdown-menu" role="menu">
                                <li><a href="{{ url('/logout') }}"><i class="fa fa-btn fa-sign-out"></i>Logout</a></li>
                            </ul>
                        </li>
                    @endif