Describe the bug, provide any errors
A clear and concise description of what the bug is. Can you paste the error into https://gist.github.com?
https://gist.github.com/kacperleague9/353f9deed4379e58f619af74301474d2
Is this happening specifically on ViaFabric?
(Optional) yes only viafabric

• It seems to not happen when using ViaVersion/ViaBackwards/ViaRewind installed on Bukkit/BungeeCord/Sponge/Velocity server.

How can we reproduce it?
Steps to reproduce the behavior:

1. Add viafabric to mods.
2. Game will crash on start.

Expected behaviour
A clear and concise description of what you expected to happen.
Game should start normally

Additional server info
[N/A]

Crash report seems incomplete, can you post it?

> net.fabricmc.loader.discovery.ModResolutionException: Could not find required mod: optifabric requires {minecraft @ [1.16.1]}

Looks like an OptiFabric issue

Looks like a config file syntax error

Hey, i ctrl + a all crash log!
Also fixed optifabric and it works correctly. Only crashes when viafabric is added.
I do not have any config files tho. Like i have only mod jars [idk why but configs dont generate]

Latest fabric fixed that issue for me

what is the version of viafabric you're trying to play with ?