The good news is that you likely don’t need to reinstall the entire program. The culprit is usually a specific Windows language setting that conflicts with how AutoCAD loads its The Quick Fix: Disable Beta Unicode UTF-8
Choose whether to back up your current settings first, then proceed with the reset. 3. Diagnose Third-Party Plugins and LISP Routines
Select the problematic DWG file and allow AutoCAD to scan and fix internal data errors.
If the error happens only when running a specific LISP: