不管我建立任何名字的controller都提示找不到，为什么啊

首页用运行

php artisan make:HomeController 

然后修改routes\web.php

<?php

use Illuminate\Support\Facades\Route;

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

对应的app\Http\Controllers\HomeController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class HomeController extends Controller
{
    public function index() {
        return view('welcome');
    }
}

报错

Illuminate\Contracts\Container\BindingResolutionException
Target class [HomeController] does not exist.

为什么啊，哪里错了呢