Error messages on newsletter subscription page (mailchimp/subscribe)

Hey Lev,

The newsletter subscription page (mailchimp/subscribe) doesn't seem to be working yet. I'm getting the following error messages on the top of the page:

Warning: array_merge(): Argument #1 is not an array in _form_set_class() (line 3490 of /Users/benkaplan/git/drupal/includes/form.inc).
Notice: Trying to get property of non-object in mailchimp_subscribe_auth_form() (line 139 of /Users/benkaplan/git/drupal/sites/all/modules/mailchimp/mailchimp.module).
Warning: Attempt to assign property of non-object in mailchimp_subscribe_auth_form() (line 147 of /Users/benkaplan/git/drupal/sites/all/modules/mailchimp/mailchimp.module).
Notice: Trying to get property of non-object in _mailchimp_get_available_lists() (line 906 of /Users/benkaplan/git/drupal/sites/all/modules/mailchimp/mailchimp.module).
Warning: Invalid argument supplied for foreach() in _mailchimp_get_available_lists() (line 906 of /Users/benkaplan/git/drupal/sites/all/modules/mailchimp/mailchimp.module).

Any ideas on how to fix?

Thanks,
Ben