Minecraft version & Mod Version:
MC 1.16.5 and mod version 1.16.4-1.3.1

Single player or Server:
Neither, just initializing.

Describe problem (what you were doing / what happened):
The mod failed to initialize on game startup.

Crash log (if any):
crash-2021-02-04_01.37.22-fml.txt

I found the root in your log file

{re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:randompatches.mixins.json:client.MinecraftMixin,pl:mixin:APP:immersiveengineering.mixins.json:accessors.client.MinecraftAccess,pl:mixin:A,pl:runtimedistcleaner:A}

Looks like immersiveengineering issue for some reason. along with registry.ConfigRegistry. could not write a config file.

also try delete storagenetwork.toml and restart