You also need to add the code below into config.asp, as stated in the readme-file:
'#################################################################################
'######################## ADDED FOR INTERNATIONAL MODS! #########################
strLangLCID = "1033"
function fLang(s)
' fLang=eval(s) ' commented out for IIS 4 compatibility, all related function calls changed
fLang=s
end function
%>
<!--#include file="langMODS_Ls3kAU4.asp"-->
If you still get an error, open langMODS_Ls3kAU4 and change the part from line 39 to the end of the file to this (Im using the english lang-file in the example):
'## SNITZ FORUM 2000 MOD LANGUAGE FILE
'## Mod Active Users 4.0
'## Author: Nathan Bales
%>
<!--#INCLUDE FILE="LangMODS_Ls3kAU4_1033.asp" -->
That should fix it.
BTW, this has been asked and answered before. There is atleast ten topics about it.