Causes of Error 9
Corrupt download or incomplete installation of AutoCAD software.
Corruption in Windows registry from a recent AutoCAD-related software change (install or uninstall).
Virus or malware infection that has corrupted Windows system files or AutoCAD-related program files.
Another program maliciously or mistakenly deleted AutoCAD-related files.
Runtime Errors such as “Error 9” can be caused by a variety of factors, so it is important that you troubleshoot each of the possible causes to prevent it from recurring.