Zandronum

Hi.
Lately I've been using allfearthesentinel to create servers and play co op with my brother. It works fine vanilla or with some mods but my server that I create crashes always on some mods that I would like to play badly. For example Final Doomer. Every time I create a server with the finaldoomer_v2.4.pk3 file it always crashes. Here are the errors that I'm getting:
https://gyazo.com/f0f9348e47cb03336133a1fe4fe58793
https://gyazo.com/ed2ce3d9bbb77f4e92e8a23103d961fc
If there's any way to fix this I would really appreciate it.

Final Doomer requires a later version of ZDoom than what Zandronum currently supports.

You can still play it multiplayer, by downloading ZDoom LE (Old ZDoom 2.8.1 works fine too) and using this guide to set up a netgame on it.