Fatal error: Uncaught Error: Interface "Sabre\CalDAV\ICalendarObject" not found in /var/www/html/nextcloud/apps/dav/lib/CalDAV/AppCalendar/CalendarObject.php:22 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/dav/lib/CalDAV/AppCalendar/CalendarObject.php on line 22