Fatal error: Uncaught Error: Class "Sabre\DAV\Collection" not found in C:\laragon\www\baikal\vendor\sabre\dav\lib\CardDAV\AddressBook.php:19 Stack trace: #0 {main} thrown in C:\laragon\www\baikal\vendor\sabre\dav\lib\CardDAV\AddressBook.php on line 19