Fatal error: Uncaught Error: Interface 'Sabre\Xml\XmlSerializable' not found in C:\xampp\htdocs\zataPhase2\vendor\sabre\xml\lib\Element.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\zataPhase2\vendor\sabre\xml\lib\Element.php on line 20