Error: ADapplicationframe.dll is Missing (Opening AutoCAD or F/X CAD)

Issue

Upon launching AutoCAD or F/X CAD, you received the following error message: ADapplicationframe.dll is missing.

CAD may have also closed automatically.

Cause

This error is a result of a problem with the .NET framework.

Solution

To resolve the issue, follow our steps to reinstall the .NET framework.