Fatal error: Uncaught Error: Interface "Sabre\Xml\XmlSerializable" not found in C:\xampp\htdocs\baikal\vendor\sabre\xml\lib\Element\Cdata.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\baikal\vendor\sabre\xml\lib\Element\Cdata.php on line 22