Fatal error: Uncaught Error: Class "ILIAS\BackgroundTasks\Implementation\Tasks\AbstractJob" not found in /var/www/html/ilias/components/ILIAS/BackgroundTasks_/classes/Jobs/class.ilCheckSumOfFileSizesJob.php:32 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/BackgroundTasks_/classes/Jobs/class.ilCheckSumOfFileSizesJob.php on line 32