Fatal error: Uncaught Error: Class "Sabre\CalDAV\CalendarObject" not found in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\CalDAV\Schedule\SchedulingObject.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\CalDAV\Schedule\SchedulingObject.php on line 17