Extrudes "until the next one", problem

Hello

I created the skin of a kite with Imagine & Shape followed by Thick Surface to get a Part.

The shape of the wing not being straight, I thought that to create the spar I could extrude a horizontal profile "until the next one" to fit the lower and upper surface of the wing (inside).

I get an error message:( Can you help me? Please

Extrusion to the surface by selecting the surface

@+ ;-)

What's the difference with "until the next one"? Stp

 

It doesn't work any better:(

Reverse:

It works, thank you.

The sketch must not be larger than the target surface:)

Bye

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