My GarrysMod Model is dark?!?

I copied it from one of my old models and decompiled that. But when I see my model of my npc in-game
Its really dark for some reason?!
The texture and stuff works fine, no pink and black checkerboard
it just is really dark
almost black

Is your model’s origin off? If the origin is below the world then the model will be dark. Also why are you putting this in mapping?

It directed me here ):
and what is a models origin
it doesnt make sense though
my other models are fine, the older ones
but after i decompiled them and everything
and change them to my new model
its dark ):