Fatal error: Uncaught Error: Class "Sabre\DAV\File" not found in C:\xampp\htdocs\baikal\vendor\sabre\dav\lib\CalDAV\CalendarObject.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\baikal\vendor\sabre\dav\lib\CalDAV\CalendarObject.php on line 14