Fatal error: Uncaught Error: Class 'UCDN' not found in E:\code\yqhswz\core\ThinkPHP\Library\Vendor\mpdf\config_script2lang.php:5 Stack trace: #0 {main} thrown in E:\code\yqhswz\core\ThinkPHP\Library\Vendor\mpdf\config_script2lang.php on line 5