Fatal error: Uncaught Error: Interface "Sabre\CalDAV\ICalendarObjectContainer" not found in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\CalDAV\Schedule\IInbox.php:15 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\CalDAV\Schedule\IInbox.php on line 15