This error is almost never caused by a single issue. It is a symptom of a deeper conflict. According to Autodesk forums and support logs, the primary causes include:
: Attempting to debug an active .NET/C++ CAD plugin project via Visual Studio (such as VS 2022 or VS 2024) can trigger an environment mismatch or exception handling loop inside the primary acad.exe pipeline. i autocad debug error acngenexe full