Fatal error: Uncaught Error: Interface "ILIAS\COPage\Editor\Server\CommandActionHandler" not found in /var/www/html/ilias/components/ILIAS/COPage/PC/PlaceHolder/class.PlaceHolderCommandActionHandler.php:24 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/COPage/PC/PlaceHolder/class.PlaceHolderCommandActionHandler.php on line 24