Fatal error: Uncaught Error: Interface 'Sabre\Xml\XmlSerializable' not found in /home/rykfgln/www/4.ta.a/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php:26 Stack trace: #0 {main} thrown in /home/rykfgln/www/4.ta.a/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php on line 26