Fatal Error when trying to access group forums in buddypress…

Our web hosting company just transferred us over to a new server, and now users are getting a fatal error when trying to access the group forums in our online community.

Here is the error: Fatal error: Call to undefined function bb_get_id_from_slug() in /home/paychec4/public_html/bravegirlsclub.com/blog/wp-content/plugins/buddypress/bp-forums.php on line 206

Does anyone know how to fix this? Will reinstalling buddypress or redoing the forums setup cause all the data in the forums/groups to be lost?