scriptlet failed message during installation

While installing VirtualMinPro on a clean install of CentOS 4 x86_64, the script output contains the following message:

Installing: virtualmin-base ####################### [26/26]
Setting Webmin theme
Setting Usermin theme
Configuring Postfix
Undefined subroutine &postifx::set_current_value called at /var/tmp/rpm-tmp.50237 line 63.
error: %post(virtualmin-base-1.0-27.rh.noarch) scriptlet failed, exit status 29

Installed: virtualmin-base.noarch 0:1.0-27.rh

Looks like some kind of error.

Status: 
Closed (fixed)