Fatal error: Uncaught Error: Undefined constant "Core\Database\DATABASE" in /var/www/songtien.hdcode.name.vn/Core/Database/DBHandler.php:26 Stack trace: #0 /var/www/songtien.hdcode.name.vn/Core/Helper/ViewHelper.php(88): Core\Database\DBHandler->__construct() #1 /var/www/songtien.hdcode.name.vn/module/Frontend/Controllers/HomeController.php(12): Core\Helper\ViewHelper->fullDataFrontend() #2 [internal function]: module\Frontend\Controllers\HomeController->index() #3 /var/www/songtien.hdcode.name.vn/Core/Router.php(51): call_user_func_array() #4 /var/www/songtien.hdcode.name.vn/public_html/index.php(32): Core\Router->dispatch() #5 {main} thrown in /var/www/songtien.hdcode.name.vn/Core/Database/DBHandler.php on line 26