Check the string values for OpenLaunch and PrintLaunch . Ensure they point directly to the true acad.exe inside your C:\Program Files\Autodesk\AutoCAD 2021\ directory. 2. Reset AutoCAD 2021 to Default Settings
. This critical runtime roadblock usually triggers a secondary "FATAL ERROR: Unhandled Access Violation Reading 0x0000 Exception" and completely halts the application launch. problem loading acadres.dll resource file autocad 2021