hi we have a licence autocad 2011.
probel is when open the dwg these masage comes & dwg closed & Dwg not recovered so pls give me help .
iam install all updated patches of autodesk .
Do you get this message with any drawing or only this one in particular?
Did you try to use Recover and Audit to fix any errors in the drawing?
Check if the same happens with a sample file, you can get one from here: