Changin webmin theme generates error

I went into webmin/configuration/webmin Themes and tried to change to MCS.linux (I may have the name wrong here) and got:

HTTP/1.0 500 Perl execution failed Server: MiniServ/0.01 Date: Sun, 1 Mar 2009 08:56:03 GMT Content-type: text/html Connection: close
Error - Perl execution failed

Undefined subroutine &main::get_left_frame_width called at /usr/libexec/webmin/virtual-server-theme/index.cgi line 83.

Closed (fixed)