I also don't know whats web-build, that I know how to "Update Your Web-Build".
1. Go on to habbo.com > Login
2. After login, go to view-source:habbo.com/client
3. Find something like this "63_1dc60c6d6ea6e089c6893ab4e0541ee0/1900" (This will frequently update on Habbo)
4. Copy it and paste it into config or elsewhere.