Follow these troubleshooting methods from the easiest to the most advanced to resolve the fatal error safely. 1. Run the AutoCAD Repair Tool

To help narrow down the exact cause of your crash, please let me know: What are you currently running?

Incompatible graphics card drivers (or Windows Graphics Settings issues) are causing issues with ACIS rendering.

The quickest fix is to re-register or replace the problematic DBX file.

The message is alarming but almost always fixable without expensive tools. By repairing the ACIS module, disabling hardware acceleration, recovering corrupt DWG files, or resetting AutoCAD, you can return to productive work within minutes. Remember: "free" in this error refers to memory deallocation, not cost—all the professional fixes above are truly free.