Fatal error: Uncaught Error: Class "Sabre\VObject\Property\ICalendar\DateTime" not found in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\vobject\lib\Property\ICalendar\Date.php:16 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\vobject\lib\Property\ICalendar\Date.php on line 16