Cross Section Curves Help

Hello all,

It’s me, again. My apologies for all these questions, but I have been trying to teach myself Rhino from these Lynda courses. Right now I’m trying to make cross-section profiles (white line) with my current blue curves. However, it’s not working. I tried exploding and joining the closed curve, but to no success. I checked the direction and tried all variations, but still no dice. Can anyone help? I’m not sure what I’m doing wrong. Any advice would be greatly appreciated.

help.3dm (3.0 MB)

Thanks!

_Csec