Fatal error: Uncaught Error: Interface "Sabre\Xml\XmlSerializable" not found in /var/www/illumine/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php:23 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php on line 23