Fatal error: Uncaught Error: Class "Sabre\DAV\Auth\Backend\AbstractBasic" not found in C:\Apache24\htdocs\dle\engine\classes\composer\vendor\sabre\dav\lib\DAV\Auth\Backend\BasicCallBack.php:19 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\dle\engine\classes\composer\vendor\sabre\dav\lib\DAV\Auth\Backend\BasicCallBack.php on line 19