AI DXF export PARM error

Hello

I haven't been able to find a satisfying answer for my problem, though I have hope it could be easily solved.

I'm trying to export a simple file with basic paths (see below) to dxf, so I can convert it to a shapefile with FME. But whenever I go for the export, I get a PARM error ("The operation could not complete because of an unknown error [parm]"). I've tried the relaunching with deleting settings (cmd+option+shift) but nothing works.

Do you see any solution?

Thank you