Fatal error: Uncaught Error: Interface "PKP\Services\interfaces\EntityReadInterface" not found in /home/aake8592/subdomains/jurnal.aakpekalongan.ac.id/lib/pkp/classes/services/PKPAuthorService.inc.php:27 Stack trace: #0 {main} thrown in /home/aake8592/subdomains/jurnal.aakpekalongan.ac.id/lib/pkp/classes/services/PKPAuthorService.inc.php on line 27