Every time I export a C3D drawing to ACAD (command: _AecExportToAutoCAD20xx), I get this "error message"
There does not seem to be a real problem because I can open the exported drawing in vanilla AutoCAD OK, (although I do still get a proxy notice..?).
A few other older threads about this reveal no solution or confirmation that this dialog is a bug.
I was getting this one time, along with the proxy entity warning too. Turned out there was one locked cogo point in the drawing that wasn't gettng exploded.
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