There is a typo in the mod for the recipe for making the molds.

recipe Craft Mold
{
Plank=4,
Dirtbag;2,
Twine,

Result:SpoonMoldFull,
Time: 100.0,
Sound:LogAddToStack,
AnimNode : Disassemble,
Category:Carpentry,
NeedToBeLearn:true,
SkillRequired:MetalWelding=2,
OnGiveXP:MetalWeldingXPLow,
CanBeDoneFromFloor : TRUE,
}

It should be Dirtbag=2,

Replace those in a few spots and you'll be good to go.