Cannot add friends from the community page or add to groups.

I get the error

Fatal error: Class 'BP_Friends_Friendship' not found in /home/janicevk/public_html/bodysculptmd.com/wp-content/themes/bp-business/_inc/ajax.php on line 597
Profile picture of societylink

My site is http://bodysculptmd.com

I have the business child theme activated and the BP plug in.

Janice