Fatel Error

Hi,

I have buddypress+ bbForum theme. While creating the topic under the Group (private), i'm getting fatel error like "Call to undefined function bb_get_id_from_slug() in <b>/home/linkstre/public_html/linkstreetstore/mingle/phase2/wp-content/plugins/buddypress/bp-forums/bp-forums-functions.php on line 178.

Is i missed anything here. Thanks