Fatal error: Uncaught Error: Interface "Sabre\CalDAV\Xml\Notification\NotificationInterface" not found in /var/www/illumine/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php:18 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php on line 18