Manage Lists Throws Error After Upgrading To CiviCRM 1.2

I just upgraded CiviCRM to version 1.2 on my civicspace site. I've never used the massmailer before but intend to now so I don't know if this error was pre-existing or not. I can create a list in the Massmailer but I can not manage and add people to it. When I click manage I get the following error: Fatal error: Call to undefined function: crm_get_groups() in /home/httpd/vhosts/votehillary.org/httpdocs/CMS/modules/massmailer/massmailer.module on line 597

I examined another post on this list re this error: http://drupal.org/node/35860 and that was not the solution to my problem.

FYI, the new CiviCRM version is working fine, its just the connection with the mass mailer that is causing an issue.

What do I need to do to resolve this glitch?