HI @dim678,
I agree with Dean that using plot gives you a lot more control over this operation.
I looked at your file and saw that it was using inches as untis while you are trying to print to a metric papersize. I used -dwgunits to change to mm.
I then created a Page Setup for the layout that includes all my plot parameters. I wanted to make sure I had the correct paper size selected and that I was plotting at 1:1 not "To Fit".
I then created a viewport in paperspace and zoomed 1:1. Now, whether I use Plot or the Export To AutoCAD, the creation of the PDF works.

Please take a look at the attached drawing file as it contains my changes. I hope this works better for you.
Please select the Accept as Solution button if my post solves your issue or answers your question.
John Vellek
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