Fatal error: Uncaught Error: Class "ilMailNotification" not found in /var/www/html/ilias/components/ILIAS/LearningSequence/classes/Members/class.ilLearningSequenceMembershipMailNotification.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/LearningSequence/classes/Members/class.ilLearningSequenceMembershipMailNotification.php on line 21