Despite having the same version of mods, even trying to manually put the jar files in both server & modpack directory, it says I have mismatched mods, and that I need the Hordes 1.5.4, I've tried changing the version in default configs live I've heard, but then it doesn't run at all.

Should be fixed in 1.20.1-1.5.4c, will be ported to the other versions soon.

You haven't forgotten about the required Atlas Lib dependency, have you?

Same, also no Atlas lib is also present in both server and client evnivorment

Atlas lib 1.1.12
Hordes: 1.5.4

Encountered the same problem

Same here, on my side I installed AtlasLib both client and my server.. the only thing that this happens if when I change the config in hordes-common after that it just happens
this is on my server

![Image](https://github.com/user-attachments/assets/4d93cfcc-30fc-4d58-a34d-08084d331473
and this is the client