Fatal error: Uncaught Error: Interface "Sabre\Xml\XmlSerializable" not found in /home/villeble/baikal/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php:25 Stack trace: #0 {main} thrown in /home/villeble/baikal/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php on line 25