Cabin - splitting returned no results


i’m trying to split a surface with a projected curve, but split surface give to me this error.
please could anyone help me?

thank you so much (137.0 KB)
probando.3dm (351.6 KB)

Some of those circles overlap, which can cause problems. I added a region intersection component before splitting the surfaces.

I reeduced the number of points for demonstration purpose and eliminated the repetitive parts of your definition. The inputs are internalised. (91.9 KB)