Fatal error: Uncaught Error: Interface "Sabre\Xml\Element" not found in C:\xampp\htdocs\baikal\vendor\sabre\dav\lib\CalDAV\Xml\Property\SupportedCalendarComponentSet.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\baikal\vendor\sabre\dav\lib\CalDAV\Xml\Property\SupportedCalendarComponentSet.php on line 26