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Home Software Tutorial Computer Software AutoCAD fatal error: unhandled access violation

AutoCAD fatal error: unhandled access violation

Jul 09, 2025 am 12:01 AM
autocad

When encountering AutoCAD "fatal error: unhandled access violation" error, it is usually caused by graphics card drivers, damaged drawings, installation problems, or system environment. The solutions are as follows: 1. Update the graphics card drivers and disable hardware acceleration or switch to integrated graphics card operation; 2. Use the RECOVER command to repair damaged drawings, clean external elements, or re-import content; 3. Repair or reinstall AutoCAD to ensure that you run as an administrator and close the third-party interceptor program; 4. Run the software as an administrator, clean up the background process, and update the .NET Framework and Visual C Redistributable. In most cases, the above steps can be solved.

AutoCAD fatal error: unhandled access violation

If you encounter the error "fatal error: unhandled access violation" in AutoCAD, it usually means that the program accesses a memory address that is not allowed to be accessed during the run, resulting in a crash. This problem may be caused by a variety of reasons, but don’t worry, let’s analyze and solve it step by step.

AutoCAD fatal error: unhandled access violation

1. Graphic driver or graphics card compatibility issues

This is one of the most common reasons. AutoCAD is more sensitive to graphics card drivers, especially when using newer or incompatible graphics card drivers, this abnormality is prone to occur.

AutoCAD fatal error: unhandled access violation

Solve Suggestions:

  • Update the graphics card driver to the latest version (recommended to download the official driver on the official website).
  • Try setting the graphics card to "Compatibility Mode", or temporarily disable hardware acceleration:
    • Open AutoCAD and enter OPTIONS .
    • Switch to the System tab and click on Graphics Performance.
    • Uncheck "Enable Hardware Acceleration".

If you are using a dual graphics card notebook (such as a integrated graphics card), you can try specifying AutoCAD in the system to run it with an integrated graphics card.

AutoCAD fatal error: unhandled access violation

2. Corrupted drawings or layer data

If an error occurs only when opening a particular drawing, the problem is most likely in the drawing itself. It may be that the layer, block reference, or xref data is corrupted.

Troubleshooting method:

  • Try creating a new blank drawing and use the Insert feature to import and exit the problem drawing content.
  • Use the RECOVER command to repair drawing files.
  • If the drawing is from a DWG file exported by other software, it may also be incompatible with the format. You can ask the other party to save as a lower version and try again.

Tips: Sometimes problematic images or OLE objects are embedded in the drawings, which can also lead to access violations. Try cleaning up these external elements before opening them.


3. Installation or update issues

This kind of fatal error may also be caused by the failure of the AutoCAD program itself, or the power outage or forced shutdown caused the update to fail.

How to deal with it:

  • Run the installation package and select Repair.
  • Reinstall the full version after uninstalling, do not use cracking tools or unofficial patches.
  • Run the installer as an administrator during installation and close third-party interceptors such as antivirus software/firewall.

If you are using a network license or floating license, you must also ensure that the license service starts normally.


4. System environment or permissions are insufficient

Some system settings, user permissions, or compatibility issues after Windows system updates can also cause AutoCAD to exit abnormally.

Common processing steps:

  • Run AutoCAD as an administrator.
  • Check whether too many background programs are enabled to occupy resources.
  • Test whether AutoCAD will still report an error in a clean boot state (i.e., disable all non-essential startup items and services).
  • Update the .NET Framework and Visual C Redistributable to the latest version.

Basically, these common reasons and solutions are all about them. Although this problem seems scary, it is not a big problem in most cases. It can be solved by checking it one by one according to the above method.

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