Fatal error: Uncaught Error: Class "ilLTIConsumerServiceBase" not found in /var/www/html/ilias/components/ILIAS/LTIConsumer/classes/class.ilLTIConsumerGradeService.php:30 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/LTIConsumer/classes/class.ilLTIConsumerGradeService.php on line 30