Hi ! I just made a new modpack, I've done modpacks for a long time, but i never got this strange error. It seems to be related to Sponge/Mixin. The last line before the error refers to Micdoodle8Core, could it be that causing it ?
[21:26:02] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[21:26:03] [main/INFO]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[21:26:03] [main/INFO]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLTweaker
[21:26:03] [main/INFO]: Forge Mod Loader version 14.23.5.285
