Offset of a curve on surface issue

I am straggling to understand why this component give me always an error.
I am trying to offset the contour of my shape inside of the surface.

The surface is an untrimmed one, and the curve is a closed curve.
Any suggestion?
Thank you

offset (14.4 KB)

Here ya go.

offset (9.2 KB)

I still get the error message!
“Curve offset failed.”

Cos I have uploaded the wrong file. Sorry :smiley:
offset (9.2 KB)

Thank you very much!!!

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