Error You dont have permission to create new topic

Hi,
I am using WordPress Version 3.5.1
along with bbPress 2.3.2 and buddy press Version 1.7.1
I have encountered a problem when I try to add post. It gives me a error message – “You dont have permission to create new topic“
Link: https://www.diigo.com/item/image/3y11f/h4uv
whenever I try to post a topic on forum as An Administrator or Keymaster.
But when I try to post with Moderator rank or any other The post gets added.

Can anyone please hep me on this.
Thanks
Sumit