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