Curves Do not Appear after UnrollCrvUV

I have a curved rectangular surface, with straight vertical lines arrayed accross this surface.

When I ‘UnrollSrfUV’ the surface unrolls, however the curves selected do not appear on the newly unrolled surface.

I have used this command before, and it has worked, not sure why it’s not working now. As far as I know the lines are aligned with the surface, so not sure why it does not unroll…

Any tips and suggestions would be greatly appreciated.

Hello - please upload the surface and curves or send to