BuddyPress.org

Im just new in buddypress and really need help with this. So here is my problem, when i installed buddypress and bpress in my site, and installed the site wide forums, i am encountering a problem that when members view others member activity it is saying “page not found” but me as admin can view members activity

ex. when logged in as admin i can view this link http://www.mysite.com/members/username
but when logged in as member and go to this link http://www.mysite.com/members/username it is saying page not found!

Is there somthing that i miss in the settings?or in the installation?I really need help regarding this. I would appreciate any help from you guys, Thanks!.