BuddyPress.org

Solved. No thanks to this forum.

Now for anyone with same question. Use a plugin called “Category Templates”. Open the php and add this to the beginning.

// Set constant for current theme directory
$dirname = get_stylesheet_directory();
define(‘STYLESHEETPATH’, $dirname . ‘/’);

Then edit lines 134 and 135 by changing to ‘TEMPLATEPATH’ to ‘STYLESHEETPATH’ on both lines.

That worked for me.