Fatal error: Uncaught Error: Class "ilMailNotification" not found in /var/www/html/ilias/components/ILIAS/Exercise/Notification/class.ilExerciseMailNotification.php:22 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Exercise/Notification/class.ilExerciseMailNotification.php on line 22