[sumit1988]

>WP is 2.7.1 and bbPress is 0.9.0.4. Both are the latest versions.

partly – bbPress has the 1.0 alpha (unstable!). And you should integrate the 1.0 with wp 2.7

I think there is some plugin to integrate 0.9 with wp 2.7 but still… read some topics about the compatible versions in this forum.

In general:

WP < 2.7 & BBpress < 1.0: yes

WP >= 2.7 & BBpress < 1.0: no

WP < 2.7 & BBpress >=1.0: no

WP >= 2.7 & BBpress >= 1.0: yes

but remember: the 1.0 alpha is not recommended to use on live sites.

(sorry if my english isn`t correct, i hope you get what i want to say)