Fatal error: Uncaught Error: Class "ActiveRecord" not found in /var/www/html/ilias/components/ILIAS/BackgroundTasks/src/Implementation/Persistence/TaskContainer.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/BackgroundTasks/src/Implementation/Persistence/TaskContainer.php on line 21