Fatal error: Uncaught Error: Interface "Sabre\DAV\ICollection" not found in /home/tzuovhm/tzuovhm/nextcloud/3rdparty/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php:39 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/nextcloud/3rdparty/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php on line 39