How to Fix Call of Duty Modern Warfare Dev Error 6065



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Over the past few days, we have received more and more requests for Divers Modern Warfare Dev. Let’s talk about it now.

Some players have problems with DEV ERROR 6065 after installing Modern Warfare Update 1.05. What’s happening?

We can’t say exactly what the reason is, but it seems to only affect PC gamers. We have researched and found solutions for some of the error codes.

The bug is related to the PC game and has been found in several versions of the Modern Warfare game. When we talk about the possible causes of this problem, there are many. Since your system configuration isn’t enough to run the game, your RAM or graphics might not be enough. In addition, an issue with graphical properties can also cause this Dev Error 6065. Users have also reported that the error occurs when the game does not start with administrator rights.

  • Insufficient system configuration
  • Graphics Properties
  • Game profile
  • DirectX
  • Administrator rights

Edit the Config.cfg file on COD

Modern warfare issue with design bug 6065 also occurs when the config.cfg file saves incorrect graphics card information.

STEP 1. Close the game completely and complete the task in the task manager.
STEP 2. Now go to Documents> (Game Name)> Player folder.
STEP 3. Find the Config.cfg file, right-click it and open it in Notepad.
STEP 4. Now find the line with the name of the video card.
STEP 5. Now check if the name of the video card is correct.
STEP 6. If not, just replace the name with the name of your system’s graphics card.
STEP 7. Save changes.

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Force the game to start using DirectX 11

  • Open the Battle.Net client on PC.
  • Open the COD Modern Warfare game
  • Go to parameters
  • Check additional command line arguments and enter -d3d11
  • Exit the game and try to see if Call of Duty Warzone Dev errors 6065 and 6066 are displayed. If so, move on to the next fix.

Disable Nvidia Overlay

It looks like disabling Nvidia’s overlay app (GeForce Experience) in most cases can fix the Dev Error 6066 issue.

Launch the Nvidia GeForce Experience app.
Click the Settings (gear) icon> Under Features, click General> Disable In-Game Overlay.

Common solutions for Dev errors:

Here we discussed various methods that tend to fix the game and effectively get rid of developer errors.

  • If you are using a second monitor, turn it off and restart the application.
  • Disable ray tracing in the game settings.
  • Try reinstalling DirectX.
  • Scan and restore the game from the Battle.net app.
  • Disable “Cross-play” in the game settings. You can find this option by going to the Options menu, then opening the Account tab.
  • Overclocking is a feature that increases the clock speed of the GPU and makes it run faster. Disabling the overclocking function can also prevent design errors.
  • Sometimes a bad internet connection leads to design errors. Check and update your internet connection. This may sound trivial, but it can be the root cause of failure.
  • ○ Options >> General tab >> Telemetry section >> Server latency.
  • ○ Activate this option.
  • If all else fails, uninstall and reinstall COD Modern Warfare.


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