Error require_once homeController

<?php

class Route {

    protected $controller = 'homeController';
    protected $method = 'index';
    protected $params = [];

    public function __construct(){

        if (isset($_GET['url'])) {
            $url = explode('/', filter_var( trim($_GET['url']), FILTER_SANITIZE_URL ));
        }

        $url[0] = $url[0] . 'Controller';

        //mengecek file controller
        if( file_exists('../app/Controllers/'.$url[0].'.php') ){
            $this->controller = $url[0];
        }

        require_once '../app/Controllers/'. $this->controller . '.php';
        $this->controller = new $this->controller;

        if (isset($url[1])){
            if(method_exists($this->controller, $url[1])){
                $this->method = $url[1];
            }
        }

        unset($url[0]);
        unset($url[1]);
        $this->params = $url;

        call_user_func_array( [$this->controller, $this->method], $params);

    }
}

?>

Screenshot from 2022-01-22 08-56-31.png

Sudah saya sesuaikan dengan tutorial, akan tetapi tetap muncul error pada require_once pada line 22. Mohon solusinya, terima kasih