Fatal error: Uncaught Error: Interface "Sabre\DAV\ICollection" not found in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\CalDAV\ICalendarObjectContainer.php:20 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\CalDAV\ICalendarObjectContainer.php on line 20