Fatal error: Uncaught Error: Class 'PKP\Services\PKPSubmissionService' not found in /opt/lampp/website77/jurnalfkip/classes/services/SubmissionService.inc.php:19
Stack trace:
#0 {main}
thrown in /opt/lampp/website77/jurnalfkip/classes/services/SubmissionService.inc.php on line 19