Issue Description:

java.lang.IllegalAccessError startup crash - Forge

Steps to reproduce:

1. Start Minecraft with Biomes O' Plenty installed

Additional Information:

https://gist.github.com/Imnuts7/998e09d7acf3a4b94843a012eeb0c219

Affected Versions (Exact numbers, do not use "latest"):

• Biomes O' Plenty: 4.1.0.2022-universal
• Minecraft: 1.9.4
• Forge: 12.17.0.1921

Same here o/
Forge changed stuff:
"Build 1.9.4-12.17.0.1920-1.9.4:
atomicblom: Add Unit Test to detect mismatches between EnumHelper and Enum ctor
LexManos: Fix paramters for addArmorMaterial, addOption and addGameType.
LexManos: Make unit test for EnumHelper more robust and less spammy. Now detects missing accessors as well."

Im sure author is aware of this and looking into it. ^^

I'm getting the same for both server and client on build 1920 - 1922