Is everything working now?...

Looks like you manually moved a site... Don't know anything about the first error 'cb_stage' is not a field used by phpbb connector... in your last error the missing 'cb_phpbbid' this should be inserted into the database when the phpbb connector is installed... so I am guessing that while you were copying database records you were also copying files (so as to not reinstall everything)... Is that right?

Greg