Fatal error: Uncaught Error: Class "ilSubEnabledFormPropertyGUI" not found in /var/www/html/ilias/components/ILIAS/Mail/classes/Form/class.ilManualPlaceholderInputGUI.php:28 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Mail/classes/Form/class.ilManualPlaceholderInputGUI.php on line 28