AutoCAD error. How to stop it?

I’ve got a DWG file. It’s AutoCAD 2004. When I’m trying to open it in my AutoCAD 2010 it gives an error:
Cannot open file. The file may be a DWG or DXF file, it may not be in a supported version of the DWG file format, or it may be corrupted. Check the file and try again.

I have no sense how to fix it.