Hi Rudy - in this case MoI thinks that you have 4 profile curves, and for sweep you can't have 2 different profile curves that attach to the rail at the exact same point, that's why it fails.

To fix this, select those profile curves and use Edit/Join to join the pieces together into one larger single curve.

After you join them, then the sweep will work as you expected.


Some commands such as extrude have a joining step built into them so you don't have to do it manually, but sweep doesn't do that right now. I guess I could add this into sweep, I'm not sure if I will be able to get to that for the V1 release though.

- Michael