Subscription plugin fatal error when creating user on subblog on 3.0

When trying to create a user on cmsdemo.sbesite.com I get a fatal error after entering user info!

Fatal error: Call to a member function get_error_message() on a non-object in /home/sbesitec/public_html/wp-content/plugins/membership/membershipincludes/classes/membershippublic.php on line 848