Hi , i want to loft two rectangles using arc as a path , but i cant , 1st i cant draw the arc in 3d so i drawned it in "Front" view , then i cant loft the rectangles using that arc as an path -"The selected entities are not valid" , maybe because i drawned the arc in "Front"(bottom left), but i cant draw it in 3d?!! Here it is some screen shot: