ReflectionException (-1) 在将项目上传到cpanel后，在laravel 5.6中类App\Http\Middleware\MyMiddleware不存在。

在上传到cpanel之前，我尝试了我的laravel项目，一切工作正常。但是在将其上传到cpanel后，所有没有中间件的页面都能正常工作，但是带有中间件的页面返回以下错误信息：

ReflectionException (-1)Class App\Http\Middleware\MyMiddleware does not exist

这里是我的中间件，位于App\Http\Middleware\MyMiddleware.php：

namespace App\Http\Middleware;
use Closure;
class MyMiddleware
{
    /**
     * 处理传入的请求。
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if(session()->has('adminId')){
            return redirect('/admin/dashboard');
        }else{
            if($request->path() == 'admin'){
                return redirect('/admin/login');
            }else{
                return $next($request);
            }
        }
    }
}

这是我的App\Http\Kernel.php：

protected $routeMiddleware = [
    'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
    'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
    'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
    'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
    'can' => \Illuminate\Auth\Middleware\Authorize::class,
    'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
    'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
    'myAuth' => \App\Http\Middleware\MyMiddleware::class,
];

这是我的routes/web.php中的路由：

Route::get('/admin', ['middleware' => 'myAuth', 'uses' => function(){
echo "nothing";}]);

在上传到cpanel之前，我尝试过以下操作：

php artisan config:clear
composer update
composer dump-autoload

但是没有成功。