I apologize if this isn't part of your mod, but I've been getting this error on my server, making impossible for anyone to join unless they take the media files from this mod and putting them into the Project Zomboid directory's version of the media folder and I was able to do that, but then this [i.gyazo.com] came up as an error as well and has continued to show up despite having taken the server's version of this file and put it in my own local/client directory as well.

What I wanted to know if this is part of your mod and also if there is a better way to get the mod working on multiplayer (since this was something that had to be done with files from your mod as well).