Fatal error: Uncaught Error: Class "Sabre\CalDAV\CalendarObject" not found in /home/tzuovhm/tzuovhm/apps/dav/lib/CalDAV/CachedSubscriptionObject.php:19 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/dav/lib/CalDAV/CachedSubscriptionObject.php on line 19