Fatal error: Uncaught Error: Class "ilAbstractLearningHistoryProvider" not found in /var/www/html/ilias/components/ILIAS/Certificate/classes/LearningHistory/class.ilCertificateLearningHistoryProvider.php:28 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Certificate/classes/LearningHistory/class.ilCertificateLearningHistoryProvider.php on line 28