Fatal error: Uncaught Error: Undefined constant "PKP\user\form\PKP_STRICT_MODE" in C:\xampp\htdocs\ojs\lib\pkp\classes\user\form\UserFormHelper.php:126 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ojs\lib\pkp\classes\user\form\UserFormHelper.php on line 126