Fatal error: Uncaught Error: Class "ilContainerGUI" not found in /var/www/html/ilias/components/ILIAS/LearningSequence/classes/class.ilObjLearningSequenceGUI.php:53 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/LearningSequence/classes/class.ilObjLearningSequenceGUI.php on line 53