I have saved .shp polygon (QGis file) to .dxf and it opened just fine in AutoCAD.
It opened as a block so I exploded the polylines and saved them as .dxf 2013 version as I usually do when I import CAD files to SketchUp. I usually uncheck everything from the options but there is still this error.
Is there some other way to import QGis .shp to .skp if this won’t work?
Here are the screenshots: