BSD Firewall module throws Perl error

I am running:
Virtualmin Pro: 3.51
Webmin: 1.400
Usermin: 1.330

This was working fine actually until I updated Webmin to 1.390. Still throws the same error in 1.400 it seems!?

This is what I get when I access the firewall module page:

Error - Perl execution failed

Undefined subroutine &net::get_rc_conf called at ./ipfw-lib.pl line 21.
Compilation failed in require at /usr/local/webmin-1.400/ipfw/index.cgi line 4.

FYI: I am using OSX (BSD) but can not find it in the "Operating System" dropdown so I had to choose ALL.

Status: 
Closed (fixed)