ah I forgot to tell you that I tried this method: I create a new part, I make a sketch plan, after clicking on file system, amounting the dwg and from that dwg should exit the solid.
from a 2d creo profile can not know what it is and what you want to do... rivoluziomne, extrusion, etc....
you have to decide how to solidify or make the surface of the curves.
as exercise I recommend you create a new profile, keeping only the one imported as a track, and creating new curved areas (not straight) with few rays or/or splines. you would get a "clean" geometry