Fatal error: Uncaught Error: Class "ilCheckboxInputGUI" not found in /var/www/html/ilias/components/ILIAS/DataCollection/classes/Helpers/class.ilDclCheckboxInputGUI.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/DataCollection/classes/Helpers/class.ilDclCheckboxInputGUI.php on line 21