WHMCS Automatic Setup Failed

Hello,

I get this error each time I try to make a new order : Error: Connection Error: 3 - No URL set!

The automatic setup fail.

I'll attach some screenshots to verify my config.

the screenshot 1,2 and 3 are the config.
the screenshot 4 is the pending order, as you see the username is missing !!

the error i receive as email is : Connection Error: 3 - No URL set!

in the plugin Remote WHMCS host, I put the domain name where WHMCS is hosted.

Can you help ?