Fatal error: Uncaught Error: Interface "PKP\Services\interfaces\EntityPropertyInterface" not found in /home/eurjchem/public_html/lib/pkp/classes/services/PKPUserService.inc.php:27 Stack trace: #0 {main} thrown in /home/eurjchem/public_html/lib/pkp/classes/services/PKPUserService.inc.php on line 27