BuddyPress.org

@mishathegoat

as DJPaul points, you do not need bp-themes directory inside wp-content ,It will cause problems.

Please move buddypress/bp-themes/ (bp-sn-parent and bp-default) to wp-content/themes and then go to SiteAdmin->Themes ,allow it from the main site and activate bp=-default using appearance->Themes

and remember to delete the wp-content/bp-tehems directory.