Fatal error: Uncaught Error: Class 'Sabre\Xml\Element\XmlFragment' not found in /home/malert/WebDAV/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php:18 Stack trace: #0 {main} thrown in /home/malert/WebDAV/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php on line 18