Fatal error: Uncaught Error: Interface "PKP\services\interfaces\EntityPropertyInterface" not found in C:\xampp\htdocs\ojs\lib\pkp\classes\services\PKPSiteService.php:34 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ojs\lib\pkp\classes\services\PKPSiteService.php on line 34