Fatal error: Uncaught Error: Interface "Sabre\DAV\PropertyStorage\Backend\BackendInterface" not found in /var/www/html/nextcloud/apps/dav/lib/DAV/CustomPropertiesBackend.php:32 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/dav/lib/DAV/CustomPropertiesBackend.php on line 32