From the error message I gather that you have phpBB installed in a seperate database from Joomla...
Take a peek at the README doc or pdf in the ZIP file. I think it will answer a few of your questions.
Also, could you post a copy of what your server setup is. At some point in the future we will try to tackle multiple databases and I would like to recreate the issue to see what solutions we can come up with.
Thanks,
Greg
Server Info like:
Apache 1.x.x
php 4.x.x
MySql 4.x.x
Joomla installed on site : jxx.xx.xx database (no usernames/passwords please)
phpBB installed on site : pxx.xx.xx database (no usernames/passwords please)
You can also PM me the info if you feel more secure about that... Thanks
CB3PD Developer - CB Connector (formerly phpBB Connector) plugin