Section Error - multiple contours

I have one solid body.  On the drawing I drew a verticallineand attempted to create a section line.  I got thefollowingmessage: "A section line cannot be created frommultiplecontours."  This is the first time in many years ofusingSolidworks that I ever got that message.  What am Idoingwrong?SolidworksDrawings And Detailing