Fatal error: Uncaught Error: Class "PKP\log\event\EventLogEntry" not found in C:\xampp\htdocs\ojs\lib\pkp\classes\log\event\PKPSubmissionEventLogEntry.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ojs\lib\pkp\classes\log\event\PKPSubmissionEventLogEntry.php on line 21