Fatal error: Uncaught Error: Undefined constant "PKP\search\PKP_STRICT_MODE" in C:\xampp\htdocs\ojs\lib\pkp\classes\search\SubmissionSearch.php:415 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ojs\lib\pkp\classes\search\SubmissionSearch.php on line 415