Fatal error: Uncaught Error: Class "ilADTDefinition" not found in /var/www/html/ilias/components/ILIAS/ADT/classes/Types/Boolean/class.ilADTBooleanDefinition.php:8 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/ADT/classes/Types/Boolean/class.ilADTBooleanDefinition.php on line 8