FIXED: COD Modern Warfare Dev Error 6065

Call of Duty: Modern Warfare is one of the best titles in the entirety of the Call of Duty series, boasting a thrilling campaign experience and fantastic multiplayer mechanics. However, have you had your play recently interrupted by the irksome Modern Warfare dev error 6065? Fret not, because we’re about to go head-to-head with it and come out on top without breaking a sweat. 

Modern Warfare has been an eminent title in the Call of Duty franchise. It easily makes the top 5 list of the series and not just because of how it plays. The iconic shooter has been hoarding a ton of revenue ever since its release in 2019. Despite being a victim of controversy over multiple facets during its both pre- and post-release period, Modern Warfare hasn’t failed to do exceptionally well.  

No one wants their multiplayer experience ruined by anything, especially when the kills are coming in: not by their moms calling them out of the basement nor by the dev error 6065. While we’ll leave it up to you to deal with the former scenario, let’s not waste any further time in getting right down to the fixes of this bothersome error code. 

  • Do note that the Modern Warfare Dev Error 6178 is of an entirely different nature. Thus, it warrants other fixes as well. Find out how to get rid of it here.

How To Fix Modern Warfare Dev Error 6065

It’s worth knowing how does the dev error 6065 actually arise before getting into solving it. A prompt diagnosis could help you understand what you’re up against, not alone help you cut down to the fixes. 

modern warfare dev error 6065
Modern Warfare Dev Error 6065

The bad news is that the cause of this issue is manifold. It can be as straightforward as a lack of administrator privileges, or as involved as updating all relevant software. 

In addition, the error can occur while you’re playing and inside a match-up spontaneously or during the start-up phase. That can also make things difficult from a solution perspective, so that’s why we’re going to bring all the possible solutions with us in this guide and make sure no stone is left unturned.

Other potential causative agents include outdated drivers, corrupt game files, and even due to high graphics settings. These are also part of the mainspring of the Modern Warfare Dev Error 6068, just so you know.

Let’s dive right into the fixes now without any further ado. 

Run Modern Warfare as an Administrator

A lackluster of admin privileges can often cause things to go haywire. The same can be the case possibly with the Modern Warfare dev error 6065, so you truly shouldn’t take your chances.

This is one of the first solutions that you can try after running into this issue. There’s nothing better than having the problem solved right away without delving into the complexity of the matter.  

Therefore, all you have to do is search for the game using the Windows Start menu and click on “Run as administrator” when the option appears. You can do the same for the Battle.net launcher installed on your PC.

There is a chance, although a slim one, that the Modern Warfare dev error 6065 will perish right from the get-go by implementing this fix. However, in the case that it doesn’t, continue reading for more solutions as we’re only getting started.  

Cross-Check the Game’s Minimum System Requirements

PC gaming and console gaming are like chalk and cheese. The two differ from each other significantly and you actually have to be wary of the game’s system requirements on the former if you want to muster up any hopes of playing it. Call of Duty: Modern Warfare, similar to other games on PC, also has a set of minimum prerequisites that need to be checked in order to run it successfully.

Therefore, it’s no wonder that the 6065 dev error can potentially arise due to insufficient hardware components on your Windows PC. Thankfully, the developer of the title—Activision—has already laid out what your device needs to pack to play Modern Warfare with little to no issues.

The following are the requirements that your PC needs to fulfill at the very least to play the game.

  • OS*: Windows 10 64-bit (v.1709 or higher)
  • CPU: Intel Core i3-4340 or AMD FX-6300
  • RAM: 8GB 
  • HDD: 246GB HD Free Space
  • Video: NVIDIA GeForce GTX 670/GeForce GTX 1650 or Radeon HD 7950
  • DirectX: Requires a DirectX-12 Compatible Device
  • Network: Broadband Internet Connection
  • Sound Card: DirectX Compatible 

You can check out the embedded link above to catch a glance at the recommended systems requirements too, but let’s now check whether your device is equipped with enough horsepower to run Modern Warfare. Right-click on the Windows icon in the bottom-left corner of the screen and select “System.” Doing so should launch a new window afterward. The following screenshot specifies where to click. 

Opening the Device's "System" Settings
Opening the Device’s “System” Settings

Once the window opens, you’ll see an “About” section. This is where all the important specifications of your device are going to be listed. Cross-check your components with the ones that are required for Modern Warfare to run. If you’re lacking something, especially the graphics area, then it might be time you look into an upgrade. 

Device Specifications
Device Specifications

That said, continue reading if your hardware specifications are already past the minimum requirements. The dev error 6065 is, therefore, probably occurring because of another reason. 

Update Relevant Software 

Outdated software never bodes well for any device. The developers of different programs are hard at work to make their products keep up with the pace of the dynamic requirements of this tech-forward age. One of the first things that you have to look out for in order to keep your PC in perfect shape is to make sure it’s up to date.

First off, this goes for your operating system, which is Microsoft Windows. It’s no issue if you haven’t upgraded to Windows 11 yet as the company will continue to support Windows 10 until 2025. However, it’s your job to never miss any update that comes your device’s way. 

Go to your device’s “Settings” section by looking it up using the Windows Search bar. You would then have to select “Update and Security” and then concentrate on what the system tells you regarding your updates. You may have to click on “Check for updates” in some cases, so do that if the situation warrants so.

Checking for Windows' Updates
Checking for Windows’ Updates

Update your PC if there are any available. If not, continue toward checking your graphics card drivers to see if they’re up to the minute or downright dated. A useful tip here would be to download a program called Driver Easy. This software, upon installation, scans your whole device to check what components have pending updates. 

Downloading the Free Version of Driver Easy
Downloading the Free Version of Driver Easy

If Driver Easy doesn’t float your boat, you can check for driver updates manually as well. Simply go into the Windows Search bar and search for “Device Manager.” The application should pop right up on your screen. Click on “Open” and it should launch right away. 

dev error 6065
Opening Device Manager on a Windows PC

The next step is to click on the arrow beside “Display adapters” and that should reveal your device’s graphics driver. Right-click on the entry to expand your options and then select “Update driver.” The following screenshot specifies where to click. 

Updating the Drivers on Windows
Updating the Drivers on Windows

Follow the on-screen instructions from there on out and see whether you can update your driver or not. It’s better to let the system look for updates automatically rather than do it yourself. 

The last facet of this section is to get in touch with any remaining updates for either the Call of Duty: Modern Warfare game or for the Battle.net client.

The latter is also essential in avoiding the dev error 6065 as much as it’s possible. Major game and desktop launcher updates are always foretold in the Call of Duty Blog. Do follow it from to time for the latest word on the shooter titles. 

If having all of the main system components fully up to date hasn’t worked either, you need to try other fixes that have been detailed below. Keep on reading and don’t lose hope just yet.   

Reinstall the Graphics Card Driver

Another fix that has been reported to work for a multitude of Call of Duty: Modern Warfare players revolves around reinstalling the graphics card driver you have on your PC. This is quite useful, especially if installing the latest updates for it hasn’t paid off either.

We first have to uninstall the component and restart the device so the system can detect it’s missing. You’ll be prompted to install the driver again by Windows itself, so you shouldn’t be worried at all regarding the reinstallation. With some spell of fortune, this should resolve the dev error 6065

The following steps are going to walk you through the process in easily understandable terms.

  1. Open the “Device Manager” on your Windows PC to begin. You can do this by looking up the application in the Window Start menu. 
dev error 6065
Opening Device Manager on a Windows PC

2. The next step is to click on the vividly apparent drop-down arrow beside “Display adapters” to reveal your graphics driver. Right-click on the component and finally select “Uninstall driver.” 

Uninstalling the Graphics Driver Using the Device Manager App
Uninstalling the Graphics Driver

3. The final step is to restart your PC after your driver is done uninstalling. You can do that easily from the Window Start menu yet again. Click on the icon, select the “Power” button, and then choose “Restart” to complete the process. 

Restarting the Windows 10 PC
Restarting the Windows 10 PC

That’s about it for uninstalling the graphics driver fix to resolve the Modern Warfare dev error 6065. Your PC will prompt you to install the component as soon as it boots back up. Fire up the game after going through the installation and check whether the error has perished. If it still continues to be a pain in the buttstock, continue reading for more solutions. 

Scan and Repair Modern Warfare in Battle.net

Call of Duty: Modern Warfare is exclusive to the Battle.net launcher. That means you cannot officially play the game through any other desktop client.

This feature-rich platform comprises many features, even a “Scan and Repair” one as well. This can potentially dig out any missing or corrupted files within the game’s directory stored on your PC and proceed to fix it.  

There is a chance that the Call of Duty dev error 6065 has occurred due to incorrect configuration on your end for some reason. Therefore, it’s probably in your best interests to go ahead and repair the game using the built-in launcher tool. 

The following steps are going to show you how to do that.

  1. The first step is to launch the Battle.net application on your Windows PC. You can click on the desktop shortcut icon if you have it there or simply search for it in the Windows Start menu.
Launching Battle.net
Launching Battle.net

2. Once done, find Call of Duty: MW under the list of your downloaded games and click on it. This should allow you to click on a gear-shaped icon which would reveal a list of options for you. “Scan and Repair” will be clearly visible from there on out, so do select it right away to begin the repairing process.

Clicking on "Scan and Repair" in the Battle.net Launcher
Scanning and Repairing Call of Duty: Modern Warfare

Let the Battle.net launcher’s repair tool do its job and wait until it finishes the game’s analysis and fixes it. Once you have been prompted that the process has concluded, restart the Battle.net program and try running the game again. If you still manage to find the dev error 6065 popping up again, you’ve still got other things to try. 

Set the Game Priority to High

Another measure to take in the hope of fixing the “application popup fatal error dev error 6065” is to tinker with the game’s priority settings. This can be dealt with in the Task Manager, where you’ll simply select the running Modern Warfare process first and then continue towards its “details” section. 

There’s not much explanation that’s needed to be provided in this case, as many players have reported fixing the dev error just by changing the priority of Modern Warfare to high. If there’s a chance of this working for your copy of the game, there’s no reason we shouldn’t give it a shot. 

The following steps are going to take it from here. 

  1. The first step is to fire up the Task Manager on your Windows PC. That can be done through the Windows Start menu or by inputting the “Ctrl,” “Shift,” and “Esc” shortcut key combination. We’re going to go with the former here. 
Opening the Task Manager
Opening the Task Manager

2. Once the application launches on your PC, search for Call of Duty: Modern Warfare amidst the list of running processes in the Task Manager. You should find it quickly somewhere around the very top. The next step after pinpointing the game is to double-click on it and then select “Go to details.” That should get you going in the right direction. 

Going to the Details Section of the Program on Task Manager
Going to the Details Section of the Program on Task Manager

3. This will take you to a separate section within the Task Manager that will allow you to change Modern Warfare’s priority settings. Right-click on the entry again, hover over the “Set priority” area, and simply click on “high” to finalize the process.  

dev error 6065
Setting the Priority for Modern Warfare to “High”

That’s all about this fix. If the overall CPU utilization on your Windows PC had been way over the top, prioritizing Modern Warfare will help bring a noticeable effect. With some spell of luck, you should now be playing the game without the dev error 6065 barging in and ruining things. 

That said, you can try out the other solutions listed in this tutorial if you haven’t been able to fix the game yet. We’ve got many more to go, so don’t fret just yet. 

Lower the Graphics Settings of Modern Warfare 

There’s one more potential solution that has worked for quite the number of players. It’s a simple enough solution to turn down your graphics settings by a significant notch.

This is to ensure that the processes within the game can be rendered smoothly without bogging down the game too much. The best part is that this fix can also come in handy for those players who are sporting inadequate system specifications for Modern Warfare

It’s definitely worth giving this a shot to see if the “dev error 6065 DirectX” issue can be resolved with it. However, there is one catch here.

This fix is for those users who can launch the game and start a match. Some users have their copy of the title crashing right at the startup. You have to skip this section and continue reading from the next fixes that we have listed in this write-up.

Therefore, waste no time in getting straight to your game if it’s in a somewhat playable state. You’ll have to venture into the “Options” area of Call of Duty: Modern Warfare.

You’ll find it somewhere near the bottom of the main interface. Once done, find the “Graphics” tab. You’ll be shown all the relevant settings in this section, so scroll down until you find “Details and Textures.” The following screenshot is for reference purposes only. 

Turn the following settings down to “Low” and you’ll be good to go.

  • Texture Resolution
  • Texture Filter Anisotropic
  • Particle Quality 

In addition, keep “Bullet Impacts and Sprays” and “Tesselation” disabled to have a better chance at achieving desirable results.  

Keeping the "Graphics" Settings on Low
Keeping the “Graphics” Settings on Low

You’re not quite done yet. You have to find the “Shadow and Lighting” settings now. You’ll have the best chances of resolving the Call of Duty dev error 6065 here, so better get to it straight away. This section of the
Graphics” settings will comprise multiple options for you to disable and keep at a low level. You’ll find the following to tweak underneath the Shadow and Lighting tab. 

  • Shadow Map Resolution
  • Cache Spot Shadows
  • Particle Lighting
  • Ambient Occlusion

Keep Shadow Map Resolution low and disable Ambient Occlusion too, which is a feature that caters to balancing the overall lighting in the game. As for Cache Sun Windows and Cache Spot Shadows, both of these options are essential to fixing the error. A multitude of users have reported fixing their game just by disabling these two, so you better follow suit straight away. 

cod mw dev error 6065
Lowering the Quality of Shadow and Lighting Settings

That’s all about it for lowering your graphics settings in this fix. All that’s left now is to start the game up and check whether it still crashes on you again or has the dev error 6065 gone away. If you still haven’t fixed the problem despite the efforts made in this section of the solutions, continue on reading for more tip-top fixes. 

Modify the Command Line Argument for Modern Warfare

We’ve got another high-quality fix lined up for you in this entry. Call of Duty: Modern Warfare is probably being played through the Battle.net desktop launcher on your PC. As iterated earlier, this platform comes with a set of unique features, including multiple optimization techniques that can alter the game’s integral processes. One of them is about modifying the command line argument.

Linux experts and everyone who’ve got their hands tainted with coding environments are already aware of the efficacy of this feature. But for those who don’t know, a command line argument or setting is basically allowing the game to be given more app data to work with. This app data can often change how the application in question will behave when it’s about to start up. 

This fix is especially recommended for those who cannot even launch the game due to the Modern Warfare Error. That said, it can also do a number for those players who get their game crashed at a later time after starting the game. Now that you know the basics of the command line argument, let’s talk about modifying it.

The following steps are going to take it from here.

  1. The first step is to open the Battle.net launcher on your Windows PC. This can be done easily through the Windows Start menu or by the Taskbar if you have it pinned there. We’re going to go with the former.
Launching Battle.net
Launching Battle.net

2. You now have to find Call of Duty: Modern Warfare listed in the area of your games which will probably be situated in the left column of the main interface. Once done, right-click on the title and select “Game Settings.” This will open up another window for you.

dev error 6065 modern warfare
Opening the Game Settings for Modern Warfare

3. The launcher will do the next task for us and take you directly to the “Game Settings” section of the overall settings of the game. As you can comprehend from the screenshot below, you will be effortlessly modifying the command line argument for Call of Duty: Modern Warfare. You first have to check the box right beside “Additional command line arguments” to make a bar appear right beneath it. Once done, use the following command and enter it in the bar. Click on “Done” when you’re finished with this step. 

-D3D11
call of duty modern warfare dev error 6065
Modifying the Command Line Argument for Modern Warfare

You’re finally through! You’ve reached the defining step now. Launch Modern Warfare on your PC and check whether the issue still persists or not. Do make sure that you reboot the Battle.net launcher before you start the game for the best results. Time to celebrate if you’ve managed to send off the issue, but keep on reading for the other solutions that we have listed in this write-up. 

Update the Game Manually By Deleting the “Data Folder”

One more method of fixing the dev error 6065 is by making the game update itself. However, you will have to take certain measures in order to do that, but all of them can pay off heavily by the end of this section. We will be going into the file location of Call of Duty: Modern Warfare, digging out the “Data” folder, and deleting all of its contents. 

As soon as you try launching the game next through the Battle.net desktop launcher, you’ll find the game wholly corrupted. A prompt will pop up at that time, notifying you that an update is required to play the game. You’ll simply follow the on-screen instructions and get all of that over with. The next time you try playing the game, you won’t be running into the Modern Warfare error hopefully. 

All of this can get a little too involved, so we’re going to jot down a tutorial to complete this step. 

How to Update the Game Manually

Do make sure that any other game, especially Call of Duty: Warzone, has been closed down before beginning the process detailed ahead. The following steps are going to take it from here. 

  1. One of the first things that you have to do in order to update the game manually is to delete the “Data” folder of Modern Warfare saved on your PC. An easy way of getting to the folder in question is to simply right-click on the game’s icon and select “Open file location.” If you don’t have a shortcut for the game somewhere on your desktop, you can access the file location through the Battle.net launcher too.
dev error 6065 modern warfare pc
Opening the File Location of Modern Warfare

2. That last step will take you directly to all the files present on your PC that are related to Modern Warfare. You’ll also find “Data” among the listed entries. Simply right-click on the folder and click on “Delete.” That should do the trick. On a side note, most game files are stored in the Local Disk (C:) section of a PC’s hardware, unless specified otherwise. Therefore, you’ll find Modern Warfare and other games that you might have on your PC stored there if you’ve been meaning to dig up the file location manually. 

Deleting the Data Folder of Modern Warfare
Deleting the Data Folder of Modern Warfare 

3. The rest of the process is nothing but undemanding. You just have to launch Battle.net on your PC, head over to the Modern Warfare game section, and attempt playing it. Doing so should prompt you with a corrupt game files error and allow you to update it altogether. Simply follow the on-screen instructions and you’ll be easily able to get your game up to speed with the latest version. The following screenshot is just a reference to how you’ll be greeted with an update page that will walk you through the installation process. 

Updating Modern Warfare
Updating Modern Warfare

That’s about it for this step! You’ve successfully updated the game manually to work out a possible solution for the dev error 6065. You’ve now hopefully fixed the game, so fire it up again to confirm. If the issue still persists, keep on reading for more fixes that we have laid out in the article. 

Set All FPS Limits to 60

There’s one more solution that has worked like a charm for many players suffering from the dev error 6065. This fix centers itself around tweaking all FPS settings in the game. In addition, this measure is best suited to the campaign of Modern Warfare and cooperative play. Therefore, it’s definitely worth giving it a go alongside other possible solutions.

The following are the FPS settings that you’ll have to tend to. Make sure that you set them each to 60, no more no less. As iterated in one of the previous sections, you’ll find these in the “Options” area of Modern Warfare. 

  • Refresh Rate
  • Mid-game FPS 
  • Menu Cap
  • Unfocused Window Cap

This is surely not the most desirable of solutions that you want for your game. Still, if you’ve got no other option left other than uninstalling and you can work with low FPS, setting all FPS limits to 60 might work out for you. You’re still free to try other fixes listed ahead if you’re not up for decreasing your frame rate.   

Increase the PC’s Virtual Memory

Truth be told upfront, increasing the PC’s virtual memory is one of the most definite fixes for the modern warfare dev error. The problem could be arising from not enough available space on your PC, especially virtual memory.

Therefore, increasing the latter could not only help boost the performance of the game but might also fix the issue at hand. We say this is a definite fix because it has worked for the vast majority of people who couldn’t play the game due to this error. 

Let’s not waste any time in getting into the step-by-step guide on increasing your PC’s virtual memory now. The following is going to take it from here. 

  1. The first step is to open the “Settings” application of your device. The specific option that we’re seeking here resides in one of the advanced system settings, so we’ll be getting to it through this application.
Opening Settings on Windows 10
Opening Settings on Windows 10

2. The next step is to click on “System” within the main interface of the “Settings” application. Doing so should take you to the next step. 

Clicking on "System" Settings
Clicking on “System” Settings

3. Completing the previous step will take you to another page. You will have to focus on the left column now. Scroll down and find the “About” section. Click on it to continue. 

dev error 6065 modern warfare pc
Clicking on “About” Within System Settings

4. You will be shown another page yet again after clicking on “About.” You now have to select “Advanced system settings” which will be located on the right side under the “Related settings” section. The following screenshot specifies where to click to get to the next step. 

Clicking on "Advanced System Settings"
Clicking on “Advanced System Settings”

5. Another window will launch right after you click on “Advanced system settings.” This will be relatively small-scale. You will have to shoot for the “Advanced” tab and then click on “Settings.” You can see how the setting description mentions virtual memory. The following screenshot illustrates what to do in this step. 

Opening Advanced Performance Settings
Opening Advanced Performance Settings

6. Another window will pop up on your screen after clicking on “Settings.” You have to click on “Advanced” one more time to find the major section that we’re after in this solution. You’ll see “Virtual Memory” and an option to “Change” it. The current paging file size for all drives is also apparent in this section. Click on the latter to get to the next step. 

Clicking on "Change" Under Virtual Memory
Clicking on “Change” Under Virtual Memory

7. This will launch yet another window on your end. The first thing that you have to do now is to click uncheck the “Automatically manage paging file size for all drives” option. Doing so will allow you to specify the virtual memory yourself rather than leaving the affair on Windows. However, before you start putting in the values, you first have to select the type of Local Drive in which you have Modern Warfare installed. The following screenshot specifies where to click. 

Modifying Virtual Memory Settings
Modifying Virtual Memory Settings

8. Doing so will allow you to specify whatever virtual memory you need to set in this section. It’s a good idea to check out your device’s specifications at this moment to ascertain how much space can be allotted here. The recommendation that we have for you is about 15 GB, so dial in those numbers, click on “Set” and finalize by selecting the “OK” button.  

Specifying Virtual Memory for Dev Error 6065
Specifying Virtual Memory for Dev Error 6065

That’s all about it for increasing the paging file size and the virtual memory of your PC to potentially fix the Modern Warfare dev error 6065. There’s a sizable chance that you can start playing the game just like normal again, but if the issue still continues to rile you up, read on for the final fix there is to this problem. 

Reinstall Battle.net

It appears that none of the fixes listed above have worked for your game if you have to resort to the good old reinstallation method. That said, uninstalling a certain program and then installing it back again is one of the many ways to fix most of the pertinent issues.

Some players have reported resolving the dev error by uninstalling Battle.net from their PCs and then grabbing the desktop client back again. 

You can try the same to check if doing so works for you or not. Programs can be easily uninstalled by going to your device’s settings section and then selecting “Apps.” A list will appear, containing all the applications that you have stored on your Windows PC.

Among the options, you’ll have to scroll down a bit to find Battle.net. When you’ve finally done that, click on the “Uninstall” button right beside the entry and that should begin the process. 

Uninstalling Battle.net From the Windows PC
Uninstalling Battle.net From the Windows PC

You can now head over to the official Blizzard website to download and install the desktop launcher again on your device. The process of that is nothing but painless, as all you have to do is follow the on-screen instructions. After going through the required steps, you’ll have Battle.net up and running in no time. 

However, this also means that you’ll have to install Call of Duty: Modern Warfare one more time. Whenever a launcher is uninstalled, all the games it comprises also go with it. The next step, therefore, is to get the game back on your system again. The file size of the famed shooter is somewhere around 30 GB, so a considerable amount of time can be taken to install the game. 

Wait until the download completes and launch Modern Warfare. Download any necessary patches or updates and run the game to see if the dev error 6065 has perished or not. You’ll hopefully be hassle-free now, given that you’ve performed the most ultimate step of them all. 

Call of Duty: Modern Warfare is all set to go down in history as one of the best COD’s ever made. The praise is owed to it by the title’s fantastic multiplayer features, diverse game modes, and a polished shooter experience that’s missing from the relatively recent Call of Duty’s. However, being an online-focused IP, the FPS is bound to run into its fair share of errors, especially the dev errors

No need to worry though whenever this issue pops up on your screen. All that you have to do is be diligent and apply the fixes detailed in this descriptive guide. We genuinely recommend starting off strong with updating your graphics drivers first as that has been reported to fix the problem in most cases. If that doesn’t do the trick for you, we’re quite sure that one of the other fixes definitely will.  

Matt Hunter


With four years of experience as a tech writer on a multitude of websites, Matt Hunter currently reports to eXputer with the latest in gaming.