Fatal Error When i make a change to display group in AdminCP to a user.
 

Fatal error: Call to a member function do_affiliates() on a non-object in /var/www/clients/client4/web17/web/vb/includes/class_dm_user.php(1829) : eval()'d code(32) : eval()'d code on line 12

Happens when i go to the users profile in AdminCP and attempt to change or edit any user's usergroup or displaygroup.

Not sure why i am getting this, any help would be awesome.