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