I am working on a tutorial covering sweeping.  The project that I am making is a bottle with a label. What is the criteria that has to be met in order to project curves? I have a solid model that has been swept ( the bottle ). I also have a curve/sketch ( the label)  lying on the front plane that I am trying to project to the surface of the bottle. But when I attempt to project, the "project curve" is greyed out/disabled. There must be some criteria that I haven't met. Can anyone help me?

Thanks!

Ray