Problem with the thicken function

Hello

I have a project for a Formula 1 steering wheel. I'm at the beginning and I'm trying to make a thicken function on a scanned surface but it gives me error messages "check face failed" or "reconstruction error" depending on the value I enter. I don't understand what's going on.

Sorry for this beginner question, but I'm one.

Could someone guide me?

I put the file in PJ

Thanks in advance

 


volant_w09_003.sldprt