New bbpress installation?
Old installation with new problem?
Have you other plugins?
Try
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.
yes new installation , ı deactive all plugins and ı changed the theme but my problem stil working , ı cant add topic to forum please help me
ok,
so given
No other plugins than bbpress
a theme of twentyten
and that you as user are set up with ‘participant’ or above authority
what exactly do you mean by ‘I cant add topic to forum’
Is this :
as a user in the front end?
as a participant or above in the back end?
what message are you getting, and when – eg “you cannot post topics…”