WeiDU Issue – Installing Mods on OS X

Alright so chances are, I'm just an idiot about this modding thing. But I've literally never gotten any mods to work because WeiDU refuses to work for me. Every time I've gotten curious over the years and tried BG1 NPC mod or some other little thing, nothing doing. I'm on Mac OS X. Here is the error message I'm currently getting, attempting to install BG1 NPC project: This IS my game directory, it DOES have chitin.key in it, so I'm really confused. A little help would be great because chances are I'm just stupid and missing something. Thanks.