Filling multiple users at a time fails

I've tried to use this very handy module giving user roles with role_expiration_time to appr. 100 users. However, setting role expiry time/date at the same time fails with this error:

Fatal error: Call to undefined function role_expire_set_expiry_date() in .../sites/example.com/modules/fill_roles/fill_roles.admin.inc  on line 56

At this moment I can see no other option but to give every role and role expiration time to users by hand to each user separately, since I need to give certain roles with expiration time. Could you confirm this? I thought Fill Roles is supposed to work nicely with Role Expire -module (http://drupal.org/project/role_expire). Without using role_expire -time there is no problem.