Fatal error: Uncaught Error: Class "PKP\scheduledTask\ScheduledTask" not found in C:\xampp\htdocs\ojs\lib\pkp\classes\task\RemoveFailedJobs.php:23 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ojs\lib\pkp\classes\task\RemoveFailedJobs.php on line 23