404 error and webdav-fs Client

Hello, I'm looking for a way to use this tool with webdav-fs but I have a 404 error and I don't understand the reason.

When I run the server dedicated to webdac-fs for client, I get a 404 and a ping on webdav server but not working.

I search to create and update word files in my web site.

Can someone who is advanced enough on this topic help me?

THANKS