Fixed Dev Error 6456 in Call of Duty Modern Warfare

Here is a complete guide on how you can fix Dev Error 6456 inCall of Duty Modern Warfare on Windows 11/10 PC. Modern Warfare is one of the most popular games in the Call of Duty franchise. However, it has its own actions of errors and issues. One of such errors is Dev Error 6456 which prevents you from playing the game. If you too are facing the same error, no worries, we got you covered. In this article, we are going to discuss several functional fixes that will help you resolve the error.

ContentsWhat causes Dev Error 6456 in Call of Duty Modern Warfare?How to fix Dev Error on Call of Duty Modern Warfare?Fix Dev Error 6456 in Call of Duty Modern Warfare1]Relaunch Run the COD Modern Warfare game as administrator2]Erase and reinstall game shaders3]Restore recent graphics driver update4]Update drivers as well as Windows5]Reinstall graphics driver6]Disable game overlays7] Verify integrity of Call of Duty:Modern Warfare game files8]Troubleshoot issues in Clean Boot State9]Reinstall Modern Warfare gameHow to fix Dev Error 5573?

What causes dev-error 6456 in Call of Duty Modern Warfare?

Here are some possible causes that could trigger Dev Error 6456 in Call of Duty Modern Warfare:

• This may be due to Modern Warfare's corrupted shader cache. If the scenario applies, you can try reinstalling the game shaders to fix the error.
• In some cases, a few users encountered the error code after updating their graphics drivers. In this case, rolling back to the recent graphics driver update should help resolve the error.
• It can also be caused by corrupted or outdated graphics drivers. So, try updating or reinstalling your graphics drivers to the latest version and see if that fixes the error for you.
• An outdated Windows operating system can also be one of the reasons that trigger this error. So make sure you have updated Windows to the latest version.
• It could also be because you have enabled game overlays. If the scenario applies, disable game overlays to get rid of the error.
• The error can also be the result of corrupted, broken, or missing game files. Therefore, check the integrity of your game files to fix the error.
• Software conflicts with the game can also be one of the causes of this error. Thus, you can resolve the error in Clean Boot State.
• If your game installation is corrupted, this error is likely to trigger. So, reinstall the game to fix the error.

How to fix dev-error on Call of Duty Modern Warfare?

To fix COD DEV ERRORS 6068, 6606, 6065, 6165, 6071, 6034, 5476, 6635, 6036, 6634, 5763 on Call of Duty Modern Warfare, make sure the Activision server status is up. Other than that, you can update your graphics drivers to the latest version, run Modern Warfare with admin privileges, disable Crossplay, scan and repair game files, or change video memory scaling. If nothing works, try reinstalling the game to fix the error.

Fix Dev Error 6456 in Call of Duty Modern Warfare

Here are the methods you can try to fix Dev Error 6456 in Call of Duty Modern Warfare on Windows PC:

1. Run the COD Modern Warfare game as administrator.
2. Delete and reinstall the game shaders.
3. Undo the recent graphics driver update.
4. Update drivers as well as Windows.
5. Reinstall the graphics driver.
6. Disable game overlays.
7. Verify the integrity of Call of Duty:Modern Warfare game files.
8. Troubleshoot issues in a clean boot state.
9. Reinstall the Modern Warfare game.

1]Launch COD Modern Warfare game as administrator

The first thing to do is try to relaunch the game with administrator privileges. If the error is triggering due to missing admin rights or some temporary issue, restarting the game and game launcher with admin rights should help you fix the error. Here's how:

1. First, exit the COD Modern Warfare game and the Battle.net launcher.
2. Now open Task Manager using the keyboard shortcut Ctrl+Shift+Esc, then end all Modern Warfare-related processes (Blizzard Update Agent, Discord, etc.).
3. Next, go to the Battle.net launcher icon on the desktop and right click on it.
4. After that, choose Run as administrator option to relaunch the game with administrator privileges.
5. Finally, open the Modern Warfare game and see if the error is now fixed.

If this method does not resolve the error for you, try the following potential fix to resolve the error.

2]Delete and reinstall game shaders

This error may be the result of a corrupt Modern Warfare Shader cache due to a recent driver update. Or, older shaders may not be compatible with updated drivers and hence the error. If the scenario applies, you should be able to fix the error by deleting and reinstalling the game's Shaders. Here are the steps to follow:

1. First, go to the game settings (Options) for Modern Warfare, then go to the Graphics tab.
2. Now locate the Restart Shaders Installation option of this tab and click on it.
3. Then press the Restart button at the next prompt and wait for the process to complete.
4. Once done, relaunch the game and see if the error is fixed now.

3]Restoring the recent graphics-driver update

If you started getting dev error 6456 in Modern Warfare right after updating your graphics drivers, it's possible that the error was due to a bug in the update or its incompatibility with the game. If the scenario applies, you should be able to fix the error by rolling back the recent graphics driver update. After that, launch the game again and check if the error is now resolved or not.

4]Update the drivers-and-Windows

Another possible cause for this error can be outdated drivers or Windows operating system. If indeed this is the main culprit, make sure to update all your drivers as well as update your Windows system. After updating the drivers and operating system, relaunch the game on the next boot and see if the error is now fixed. Otherwise, try the following potential solution to fix the error.

5]Reinstall the graphics driver

You are likely to receive this error code when your graphics drivers are corrupted. Therefore, uninstall then reinstall the graphics drivers and then see if the error is fixed.

6]Disable game-overlays

Using too many game overlay options can cause the error in hand. So, try disabling game overlays and then see if the error is fixed or not.

To disable Modern Warfare's FPS counter, you can follow the steps below:

1. Open the game's Options menu and navigate to the General tab.
2. Disable the Frames per second (FPS) toggle under Telemetry.
3. Relaunch the game and see if the error is fixed.

You can disable GeForce Experience Share Overlay by following the steps below:

1. Open GeForce Experience and go to its settings.
2. In the General tab, turn off the Share toggle.
3. Reopen the Modern Warfare game and see if the Dev error is gone now.

Similarly, you can disable other overlay options in apps like Discord and see if the error is fixed now.

7]Verify the integrity of Call of Duty:Modern Warfare game files

The error can also be triggered if the game files of Call of Duty:Modern Warfare are corrupted or missing. If the scenario applies, you should be able to fix the error by verifying the integrity of the game files. To do so, follow the steps below:

1. First, start the Battle.net launcher and tap on the Call of Duty:Modern Warfare game.
2. Now you will see a gear/settings icon near the play button; just click on it.
3. Then tap on the Scan and Repair option and let the checking process complete.
4. Once finished, reopen the game and see if the error is resolved now.

If the error persists, proceed to the next potential fix to get rid of the error.

8]Troubleshoot in a clean-boot state

One of the reasons for this error can be software conflicts with the game. If the scenario applies, you can start Windows in a clean boot state to avoid any application conflicts.

9]Reinstall Modern Warfare game

The last resort to resolve the error is to reinstall the Modern Warfare game. It is possible that the game installation is corrupted and this is what is causing the error at hand. So, uninstall then reinstall the game by following the steps below:

1. First, launch the Battle.net app and tap on Modern Warfare.
2. Now click on the Gear icon which is present next to the Play icon.
3. Then tap on the Uninstall option and confirm to uninstall the game.
4. When the process is complete, restart your PC.
5. After that, start Battle.net, then reinstall the game.

I hope you don't receive the same error code again.

How to fix dev-error 5573?

To fix Dev error 5573 on Call of Duty Warzone, verify the integrity of your game files, install all COD updates, and install all pending Windows updates. Other than that, you can try performing a clean boot or resetting the game settings.

That's it!