You want to open it in Advance Steel or pure ACAD? Have you tried a recover with this file?
Do you want to attach the file here?
Hello haedicu,
I saved this file in AdvanceSteel and would like to open it in the same software.
When I open the file in AutoCAD, opened normal.
My solution to not lose the work he was doing was already saved it in another file type as 'dxf' and import it in AdvanceSteel.
Thanks, Rafael
From the attached picture I see that you recieved the error during insert (as a block reference?), can you please mention if the same error appears also when trying to open the respective dwg as a file, while Advance Steel was running ?