Form designer error


I have a problem after install form designer app. When i'm trying to connect to the sharepoint list, i'm geting an error "unnable to retrieve the supported version number. Screenshoot is in attach.
Could somebody help me with this issue?

Hi Igor,

It looks like you have selected an incorrect authentication method at the initial step. Try using windows authentication and enter your login and password manually, do not forget your domain: DOMAIN/login.