Fatal error: Uncaught Error: Interface "ilCronManager" not found in /var/www/html/ilias/components/ILIAS/Cron/classes/class.ilCronManagerImpl.php:24 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Cron/classes/class.ilCronManagerImpl.php on line 24