"namespace for closing document is not found"

[elmoleaf]

Hello,

Acad 2011 will not open a dwg file created by Illustrator CS5. It only flashes a quick message "namespace for closing document is not found".

Acad 2010 will open the same dwg file without problem.

Does anyone know how to get 2011 to open such a drawing file? Eventually I don't think I'll have the option to open these files in 2010.
Thank you.

[rkmcswain]

Each subsequent version of AutoCAD is more stringent than the previous in validating data during open/import operations. It sounds like 2011 is finding errors in the DWG file that 2010 isn't catching.

Have you tried the ._RECOVER command in 2011?
Can you export from CS5 to another format (DXF?)

[cadtag]

you might want to try loading Draftsight (free cad app) and see if that gets better results with a dwg originating in Illustrator

[elmoleaf]

Recover didn't work.
However, Illustrator can export a DXF and ACAD 2011 opened that format without problem.
It's been eons since I've had to use dxfs, so I'd completely forgotten about them.
Thank you!