[@robin-w Moderator 12 years, 5 months ago]

ok, could be lots of things, presume you’ve referred back to your developer?

and presume this is a new installation of bbpress, so has never worked?

I’d start by trying :

Plugins

Deactivate all but bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.

Themes

If plugins don’t pinpoint the problem, switch to a default theme such as twentytwelve, and see if this fixes.