Fatal error: Uncaught Error: Undefined constant "PKP\plugins\PKP_STRICT_MODE" in C:\xampp\htdocs\ojs\lib\pkp\classes\plugins\PluginHelper.php:252
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\ojs\lib\pkp\classes\plugins\PluginHelper.php on line 252