Fatal error: Uncaught Error: Interface "Sabre\Xml\Element" not found in /server/www/10.1.1.5/htdocs/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php:29 Stack trace: #0 {main} thrown in /server/www/10.1.1.5/htdocs/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php on line 29