Cant open/import Autocad files!

Hi Rhino for Mac folks

I have the latest Rhino for Mac running 5.5.2 and the latest Autocad Mac.

I have a few Autocad files I want to import into Rhino to make a 3d model.
But then I import any Autocad files DWG and DXF it comes up with an error.

File has errors – Attempting recovery.

Some objects may be changed or deleted.
Read commandline messages to see recovery results.

and

Opendesign error : Invalid file version

Can’t recover file.

Does anyone know how to fix this problem? I know I’m not the only one with this problem. I have tried to the Autocad file in all the available file formats.

Rhino please fix this problem