I've got the same message, but I (foolishly) set everything up before I installed Rokbridge, now I'm thinking that I'm going to have to re-install?
I wanted the site and forum on two different sub-domains... I don't think this is going to work is it?
site.mydomain.com
(Joomla)
> Linked with Rokbridge?
forum.mydomain.com
(PhpBB3)