Problem w/ path selection on sweep-cut

Hello,

I'm trying to do a profile sweep-cut, using a trapezoidal profile sketch and a linear path.  The path is a construction line on the top surface of a block, and the profile is on the side.  I created a pierce relation between the midpoint of the upper line on the profile sketch and the line intended for the path.  When I select the Feature "Swept Cut" I am able to assign the profile sketch, but not the path.  When I do, I get the following menu of options, however none seem to do anything (except cancel).  I have been unable to select the line as the path.  Ironically, I did this twice last week, so there's a hole in my learning somehwere.  Here's a screenshot of the menu, profile, and path sketches:

SolidworksParts And Features