Some Modern Warfare players may encounter Dev Error 6456. If you are getting this error for no apparent reason, this troubleshooting guide might help.

In this post, we’ll show you the potential solutions that we’ve collected over time since error 6456 was first widely reported. We also provide a brief discussion of the possible reasons why this error may be happening.

What are the reasons for Modern Warfare Dev Error 6456?

We’ve compiled a number of possible reasons why you may be getting Modern Warfare Dev Error 6456. Check out each of these factors below.

Random game bug.

Modern Warfare Dev Error 6456 can sometimes be triggered randomly. If there’s no clear pattern when the error happens and the problem only happens once, your PC may have simply encountered a snag.

However, if the problem occurs persistently and there’s a pattern that leads to it, continue your troubleshooting by following the solutions in this guide.

Outdated Graphics card drivers.

Dev errors are usually related to GPU drivers so the best thing that anyone can do to prevent an error is to ensure that the latest drivers are installed. If you are not sure whether or not your PC runs updated drivers, you can always manually check for them.

DirectX version incompatibility.

Modern Warfare error 6456 implies that there is an issue with DirectX on your machine.

At its most basic level, DirectX acts as an interface for a Windows machine to allow it to play games, and other forms of media. Simply put, a PC needs to install DirectX so it can function as a gaming platform. If your computer has an issue with DirectX for some reason, this can translate into errors like Dev Error 6456.

Third party software interference.

Other players have reported to us that they were able to fix Error 6456 on Modern Warfare after disabling third party programs or their overlay. Some of the mentioned programs include Discord and NZXT Cam.
To know if you have a problem with a third party program, try deleting the suspected software and play the game for some time. If there’s no Error 6456 on Modern Warfare after doing so, then that particular program may be at fault.

Other unknown software issues.

Game errors may sometimes occur due to an issue with an outdated Windows OS. Make sure that you are running the latest Windows version as part of your troubleshooting.

How to fix Modern Warfare Dev Error 6456

Fixing Modern Warfare Dev Error 6456 is straightforward and usually occurs due to a third party software. Below are the potential solutions that can help you resolve this problem:

Restart COD Modern Warfare.
In case the problem is due to a temporary bug, the first thing that you need to do is to close the game and load it up again. This is usually an easy fix if the cause of the problem is due to a random game bug.
Install updates.
Keeping the software environment of your PC should be an easy quick fix for gaming-related issues. Some problems particular Dev Errors in Call of Duty franchises are fixed by simply updating the following:
-GPU / graphics card drivers
-Windows OS
-Third party programs or apps
-other drivers
Update Graphics card driver.
In case you’re not aware what GPU you have on your computer (NVIDIA or AMD), you can follow these steps:
-Press the Windows button on your keyboard.
-Search for Device Manager.
-Open Device Manager.
-Navigate to Display Adapters.
-Click on the arrow beside Display Adapters.
-Right click on your GPU.
-Select Update driver.
Check for the problem again.
Reboot your PC.
If updating won’t improve the situation, the next good thing that you can do is to refresh the system by doing a complete power cycle of your computer. To do that, you want to shut the PC down normally. Then, you want to unplug its power cable from the outlet for about 30 seconds. Afterwards, turn everything back on again and check for the problem.
Restarting is usually effective in fixing bugs that develop when a PC is left running for an extended period.
Close third party programs.
If you are getting Dev Error 6456 when playing Call of Duty Modern Warfare, it can be due to an issue with a program that runs on your PC. Some players discovered that they were able to eliminate dev error 6456 by turning off their NZXT Cam overlay. I can’t personally confirm if this works though but you should try this suggestion if you happen to be running this particular application when gaming.
The idea is to check if a third party app is the reason for the problem. If you have other programs when playing Modern Warfare, try to see if they are the reason by disabling them.
Fix corrupted game files with Scan and Repair.
If your game is still crashing at this time, the next step that you can do is to repair COD Modern Warfare game files. This is done by going into the Blizzard application (Battle.net). Here’s how to do that:
-Open Battle.net.
-Select Call of Duty: MW game.
-In the middle of the screen, click on the gear icon to access Options.
-Select Scan and Repair.
-Click Begin Scan.
Reinstall Call of Duty Modern Warfare.
If you haven’t fixed Modern Warfare Dev Error 6456 at this point yet, you should delete the game and install it again. A clean install is sometimes necessary to fix deep-seated bugs that usual basic troubleshooting can’t fix.