Laravel 8 - Target class [Controller] does not exist

*** Mở file: app/Http/Providers/RouteServiceProvider.php

*** Thêm dòng code: protected $namespace = 'App\Http\Controllers';

<?php

namespace App\Providers;

use Illuminate\Cache\RateLimiting\Limit;

use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;

use Illuminate\Http\Request;

use Illuminate\Support\Facades\RateLimiter;

use Illuminate\Support\Facades\Route;

class RouteServiceProvider extends ServiceProvider

{

    /**

     * The path to the "home" route for your application.

     *

     * This is used by Laravel authentication to redirect users after login.

     *

     * @var string

     */

    public const HOME = '/home';

    protected $namespace = 'App\Http\Controllers';

    /**

     * The controller namespace for the application.

...