iron goblem configuration error

Are you using any resource packs?

Also, please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|https://minecrafthopper.net/help/guides/finding-minecraft-data-folder]) here.

Relates to MC-166056, MC-165967, MC-166062, MC-166192.

Forward-resolved towards MC-166322.