Fatal error: Uncaught Error: Class "Sabre\DAV\Auth\Backend\AbstractDigest" not found in /var/www/illumine/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php:12 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php on line 12