Thread:Extension talk:InviteSignup/"No email address" error from "create account" form

Running MediaWiki 1.22.5 with a few extensions.

The email link is http:// /index.php?title=Special:UserLogin/signup&invite=4c2d4327c0c65a093e82f7989ab69aa6959b06ea&returnto=Special%3ADashboard.

Fill in a userid and password and click on "Create your account".

An error is displayed - "Account creation error. No email address"

I suspect it is either a permissions issue or a conflict with another extension.

Any suggestions?