Can't bake SCULPT MAPS

Hey
I hope anybody can give me a hint to solve this problem:
Sometimes when i made a sculptie via primstar 2, blender cant bake a sculpt. It can be a simple cylinder i have shaped for a shoe.
Sometimes i had no problems and everything work like a dream. I cant see what i do wrong.

you mean displacement maps?

I think so?. It’s a RGB map for sculpties used in SL or another open sim.