Fatal error: Uncaught Error: Interface "Sabre\DAV\Auth\Backend\BackendInterface" not found in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\DAV\Auth\Backend\AbstractBearer.php:24 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\sabre\dav\lib\DAV\Auth\Backend\AbstractBearer.php on line 24