I ment to display a different error (only line and arcs may be used to create lofted bends.) I have seen multiple vidoes of people useing splines to create sheet metal parts?
I to had this error "only line and arcs may be used to create lofted bends". The new release 14 did allow me to select sketches containing splines. There is a new option under lofted bend. "Manufacturing Method" select "formed". Then you can select the two sketches.