Hi Pilou, thanks for posting the file.

So I see in your file that you seem to be creating a sweep.

What are you trying to use the Rebuild command for in this case?

The Rebuild command is something that you would use to edit curves - in your case the sweep seems to be creating a proper result, and there is no need to use the Rebuild command as a separate step.

Could you maybe describe what kind of result you're trying to get different from the sweep that you already built?

- Michael