Question about "Create UV Curves"

Hi there, I am new to Rhino and I have a question regarding the “Create UV Curves” Command, when I try to create a UV curve from a “Sweep from 2 rails” surface, instead of creating a UV curve as one entity, the “Sweep from 2 rails” surface had been divided into three section and I can only select them individually. Had I done something wrong with model ? Could anyone help me to resolve this issue? Thank you.

Sweep2 created a polysurface, not a single surface. This will occur if one or both rail curves are polycurves and not simple curves.

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