Version Info

• Minecraft, 1.12.2 Forge 14.23.5.2860
• Core Lib, 1.0.9a-mc1.12

Steps to Reproduce

1. install preview_OptiFine_1.12.2_HD_U_G6_pre1.jar
2. install supermartijn642configlib-1.0.9a-mc1.12.jar, supermartijn642corelib-1.0.16-mc1.12.jar, movingelevators-1.3.5-mc1.12.jar
3. start the game

Crash report

latest.log

Should work now with my core library version 1.0.16b for 1.12.

Thank you so much.