I did what you said, but I think I'm doing something wrong
Can you check my workbench file? I give you a link.
>> https://drive.google.com/file/d/1w-2-RpQeCO8ftRC7pvpprdcRqe35a87S/view?usp=sharing
Is there a problem with this warning?

And when 'contacts' was 'no separate', this shape came out.

Is it because the geometry is not flat?
thank you.