Fatal error: Uncaught Error: Interface "ILIAS\COPage\Editor\Server\CommandActionHandler" not found in /var/www/html/ilias/components/ILIAS/COPage/PC/Grid/class.GridCommandActionHandler.php:29 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/COPage/PC/Grid/class.GridCommandActionHandler.php on line 29