Fatal error: Uncaught Error: Class 'Sabre\CalDAV\CalendarObject' not found in /home/malert/WebDAV/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php:15 Stack trace: #0 {main} thrown in /home/malert/WebDAV/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php on line 15