[@robin-w Moderator 12 years, 2 months ago]

ok, could be a number of issues

start with theme and plugin as it could be a theme or plugin issue

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, as a test switch to a default theme such as twentytwelve, and see if this fixes.

Then look at the documentation to see what else you might need to do

Step by step guide to setting up a bbPress forum – Part 1