Fatal error: Uncaught Error: Class "Sabre\DAV\Auth\Plugin" not found in /var/www/html/nextcloud/apps/dav/lib/CalDAV/Auth/PublicPrincipalPlugin.php:16 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/dav/lib/CalDAV/Auth/PublicPrincipalPlugin.php on line 16