Fatal error: Uncaught Error: Class "Sabre\DAV\ServerPlugin" not found in /home/tzuovhm/tzuovhm/apps/dav/lib/CardDAV/MultiGetExportPlugin.php:16 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/dav/lib/CardDAV/MultiGetExportPlugin.php on line 16