I have download the [Citizen Kane](http://wordpress.org/extend/themes/citizen-kane) from WordPress theme repository.

When I am trying to activate it gives somthing like in the location `Dashboard->Appearence->Themes`

**Broken Themes
 The following themes are installed but incomplete. Themes must have a stylesheet and a template.
Name Description
Citizen Kane The parent theme is missing. Please install the "bp-default" 
parent theme.`**

Please help If any body have idea .I shall be very thanful to you all
I am waiting for ur reply