Fatal error: Uncaught Error: Interface "Sabre\DAV\ICollection" not found in C:\xampp\htdocs\baikal\vendor\sabre\dav\lib\DAV\IExtendedCollection.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\baikal\vendor\sabre\dav\lib\DAV\IExtendedCollection.php on line 17