Cannot unload charcoal forge

I tried unloading my charcoal forge and got an error, the game didn’t crash, and the charcoal remained in the forge. I received this message:


Mods:
DDA
Aftershock
Craftable Gun Pack
Makeshift Items Mod
Medieval and Historic Classes
More Survival Tools
Hydroponics
Vehicle Additions Pack
Folding Parts Pack
No Fungal Monsters
Classes and Scenarios Mod

Build 9211