Các bác cho em hỏi code này có vấn đề gì với ạ, nó báo lỗi Fatal error: Class 'modLastCustomerHelper' not found <?php /** * Hello World! Module Entry Point * * @package Joomla.Tutorials * @subpackage Modules * @link * @license GNU/GPL, see LICENSE.php * mod_helloworld is free software. This version may have been modified pursuant * to the GNU General Public License, and as distributed it includes or * is derivative of works licensed under the GNU General Public License or * other free or open source software licenses. */ // no direct access defined( '_JEXEC' ) or die( 'Restricted access' ); // Include the syndicate functions only once require_once( dirname(__FILE__).DS.'helper.php' ); $order = modLastCustomerHelper::getItemsOrder(); require( JModuleHelper::getLayoutPath( 'mod_lastcustomer' ) ); ?>