在 laravel 7x 上找不到“Illuminate\Foundation\Auth\AuthenticatesUsers”的特征

我不明白为什么当我导航到我的Laravel项目的管理员登录页面时，我会收到上述错误。Laravel版本是7x。我该如何解决这个问题？

<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;


class LoginController extends Controller
{
    use AuthenticatesUsers;

    /**
     * Where to redirect admins after login.
     *
     * @var string
     */
    protected $redirectTo = '/admin';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest:admin')->except('logout');
    }

    /**
     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
     */
    public function showLoginForm()
    {
        return view('admin.auth.login');
    }
}