Не работает PHP. что-то упустил?

<?php

$engine = new Engine();


include("resource/cap.php");

if ($engine -> getError ()) {
	$engine -> getError();
}

echo $engine -> getContentPage();

include("resource/footer.php");




class Engine {
 
    private $_page_file = null;
    private $_error = null;
 
    public function __construct() {
        if (isset($_GET["page"])) {
            $this->_page_file = $_GET["page"]; 
			
            $this->_page_file = str_replace(".", null, $_GET["page"]);
            $this->_page_file = str_replace("/", null, $_GET["page"]);
            $this->_page_file = str_replace("", null, $_GET["page"]);
 
            if (!file_exists("resource/" . $this->_page_file . ".php")) {
                $this->_setError("Шаблон не найден");
                $this->_page_file = "404";
            }
        }
        else $this->_page_file = "main";
    }
 
    private function _setError($error) {
        $this->_error = $error;
    }
 
    public function getError() {
        return $this->_error;
    }
 
    public function getContentPage() {
        return file_get_contents("resource/" . $this->_page_file . ".php");
    }
 
    public function getTitle() {
        switch ($this->_page_file) {
            case "main":
                return 'Главная' . ' | F0p3r';
                break;
			case "news":
                return 'Новости' . ' | F0p3r';
                break;

            case "404":
                return 'Страница не найдена' . ' | F0p3r';
                break;
			case "403":
                return 'Доступ ограничен' . ' | F0p3r';
                break;
			case "502":
                return 'Страница не найдена' . ' | F0p3r';
                break;
            default:
                break;
        }
    }
}

?>