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Issue description:

While trying to start up the game. It crashes

Steps to reproduce:

1. Launch the game

Version:

Forge: 36.1.4

Mekanism: Mekanism-1.16.5-10.0.21.448

Crash Report:
crash-2021-04-06_00.18.26-fml.txt

What do you mean? 36.1.4 is the newest version.
See http://files.minecraftforge.net
You mean 36.0.39.

oh wait i got confused nvm
facepalms

your forge version is wrong
you need 36.1.39 or higher
.39 is NOT a decimal number

Some mod is being dumb and adding a null layer render to an entity, which would normally cause the game to crash as soon as the game tries to render that entity. So this doesn't really have anything to do with us beyond the fact that we end up causing it to crash on startup instead of on rendering due to us trying to check what type of render layers it has.. I did add protection code against mods being dumb like this in 10.1 but truth be told the crash isn't really as much Mekanism's fault as one of your other mods.

Some mod is being dumb and adding a null layer render to an entity, which would normally cause the game to crash as soon as the game tries to render that entity. So this doesn't really have anything to do with us beyond the fact that we end up causing it to crash on startup instead of on rendering due to us trying to check what type of render layers it has.. I did add protection code against mods being dumb like this in 10.1 but truth be told the crash isn't really as much Mekanism's fault as one of your other mods.

Is there any specific direction of what the mod confliction could be? Or do I have to look into it more

It most likely is some mod that adds entities, though there is a very remote chance that it is a mod not adding an entity that is causing it.

Alright, I have a few ideas of what it could be. Thank you very much!

It most likely is some mod that adds entities, though there is a very remote chance that it is a mod not adding an entity that is causing it.

Found it. It was a mod called "Outvoted". Added a mob that was from an old minecraft update that wasn't released. So ig don't keep these two mods away from each other haha