Description of the issue:

Crash after success world generation. After removing all other mods this one has to be "broken".
The same issue was in Mekanism mod - NoSuchMethodError (It is fixed already).

Crashlog:

[SERVER]
crash-2020-07-16_23.58.25-server.txt
debug.log
latest.log

[CLIENT]
crash-2020-07-17_00.20.13-server.txt
latest.log
(It's strange but there is no debug.log)

Versions & Modlist

Forge: 32.0.67
Minecraft: 1.16.1
ImmersiveEngineering: 0.16-106

Getting this one, with the same crash, on Forge 32.0.68 as well. In my case, it crashes after both creating a new world and loading worlds created and played on in Forge 32.0.66.

That is happening because as of Forge 32.0.67 how commands are registered has slightly changed.

This is also already fixed for IE.
Duplicate of #4083

Please search next time.