Cap Planner failed

Cap Planner failed.3dm (114.7 KB)
I created an open polysurface with sweep 1 rail, I want to use Cap Planner Holes to make it a solid but failed.

Attached is the Rhino file, I tried SelBadObjects but no object selected, so what’s wrong with my object?

Thank you.

use zoomnaked, then you will see where the problem is. I have exploded your surfaces, so that you can see it.

Oh I see. I got it works. Thank you so much!