I am attempting a fairly simple loft. I wish to create a lofted surface from two curves drawn on planes 90 degrees from each other, with end points coincident. The issue arises when I add rails. I have performed similar lofts before without issue and I am wondering why this particular operation does not produce a meaningful result. My rails are separate 3D sketches, and they are coincident to both curves.
I have attached my .ipt file: I am trying to loft the red curve (sketch 7) to the orange curve (within sketch using the magenta rails (3d sketches 12 and 13)
4491A.ipt
I am using Inventor 2015