Login Error

I set up a new user to test out the site I am making and when I try to sign in with new user I get this error
Fatal error: Call to undefined method BP_XProfile_Group::get_all() in /homepages/15/d187551823/htdocs/ChicagoUrbanNetwork/wp-content/mu-plugins/oci_bp_group_forums.php on line 346

Can anyone help