When I start solidworks and draw a sketch and then try to save it as a DXF file I get the error as said in the title! I then save the sketch as a SW part, restart SW and only then I can save it as DXF! But it's just one time, because after I close that sketch and if I start a new one or even erase everything and re-use that sketch to make another drawing it won't let me save as DXF again. So, I then need to repeat the entire process again! Anyone can help?