Servers fail to load, including hosting to LAN when this mod is enabled.

No other mods present.

crash-2023-06-24_17.35.24-fml.txt

It's a client-side mod. It shouldn't be on the server.

then it should be developed correctly according to the forge dev documentation

https://docs.minecraftforge.net/en/latest/concepts/sides/#writing-one-sided-mods