Webdav acces with Elfinder : error code 500

[pfleche]

hi,

I try to use Flysystem driver to connect to a webdav target with elfinder.
I use 2.1.53 version of elfinder.
It is installed on Windows server with IIS.
I am used to use LocalFileSystem driver with Elfinder and it work correctly.
With Flysystem and webdav I have a 500 return code.
I have tried to install the Flysytem driver like this : https://github.com/barryvdh/elfinder-flysystem-driver
The content of my connector.minimal.php below

require './driver.php';
use Sabre\DAV\Client;
use League\Flysystem\WebDAV\WebDAVAdapter;

$settings = array(
'baseUri' => 'http://localhost:8080',
'userName' => 'user',
'password' => 'pwd',
);

$client = new Client($settings);
$webdavAdapter = new WebDAVAdapter($client,"/content/default/");
$webdavfs = new Filesystem($webdavAdapter);

$opts = array(
'debug' => true,
'roots' => array(
// WebDAV
array(
'driver' => 'Flysystem',
'filesystem' => $webdavfs
),
)
);

// run elFinder
$connector = new elFinderConnector(new elFinder($opts));
$connector->run();

Is there another file log than IIS log like \intepub\logs\logfiles ?
Any idea why I have a 500 error code ?

Thanks