BuddyPress.org

Aytac-

Is the premium theme BuddyPress enabled? Is it designed specifically for use with BuddyPress? If so, contact the theme designer and tell them of your issue. They are the ones who should be providing support.

If the premium theme is not designed to be used with BuddyPress, then choose a theme that is.

if I use default theme Buddypress admin bar is working well

Since this is not a BuddyPress support issue but an issue with a custom theme, I’m setting this to resolved. As you state, your site works fine with the defualt BP themes.