To Reproduce
Steps to reproduce the crash:

1. add mod
2. start game

Screenshots

Versions

• Forge: 1.12.2-forge1.12.2-14.23.5.2847
• Flan's Mod: 1.12.2-5.5.2

Crash Log
< The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Flan's Mod: Apocalypse (flansmodapocalypse)-->

crash-2020-02-22_11.41.43-client.txt

You're using an old version of the mod:
https://github.com/FlansMods/FlansMod/releases