AutoCAD Inventor :: Non-tangent Curves Found In Path Error

I have created a bin/vat/tub using sheet metal.  I started with a contour flange. I then copied the sketch and pasted into a new sketch off the flange for a contour roll feature. Then a flange, roll, flange, roll, flange and roll.  My trouble starts at the last flange.  I'm trying to construct the flange exactly as I have created the features before. I set the distance, select the profile (it shows the flange on the screen), hit apply and that's when my message shows up. "Non-tangent curves found in path: flat pattern cannot be correctly created. Edit sketch and add constraints to the curves. The sketch is fully constrained according to the lower right hand corner and the auto constrain button.