Fatal error: Uncaught Error: Class "ILIAS\Notifications\ilNotificationHandler" not found in /var/www/html/ilias/components/ILIAS/Notifications/classes/ilNotificationOSDHandler.php:31 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Notifications/classes/ilNotificationOSDHandler.php on line 31