15 Fixes For COD Modern Warfare ‘Dev Error 6178’

dev error 6178

Call of Duty Modern Warfare is a popular first-person shooter game. But like any other game, crashes and lags are part of it. Dev Error 6178 is one of them. This error can happen at any time during the gameplay, but usually, it happens when you open a map or when the camera turns to the player after losing. The game shows the dialog box Fatal Error Dev Error 6178, and the game crashes. Let’s know how to fix it.

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Causes of Dev Error 6178 on COD Modern Warfare and Warzone

  • The game doesn’t have administrator privileges
  • Too many programs are open
  • The Texture Resolution is set at Low
  • V-Sync and G-Sync are enabled
  • NVIDIA Highlights are crashing the game
  • In-Game Overlay is enabled
  • Modern Warfare game files are corrupted
  • Graphics drivers are out of date
  • Virtual memory (page file) is low
  • Antivirus is blocking the game

How To Fix Dev Error 6178 on Call of Duty Modern Warfare

After rebooting your computer and router, follow these steps to solve the Dev Error 6178 on COD Modern Warfare and Warzone:

  1. Run Modern Warfare as an Administrator
  2. Turn off In-Game Overlay from the NVIDIA Application and Other Overlay Programs
  3. Disable NVIDIA Highlights from the Game Settings
  4. Close Unwanted Programs While Running Modern Warfare
  5. Disable V-Sync from the Game Settings and NVIDIA Control Panel
  6. Disable G-Sync from NVIDIA Control Panel
  7. Run the Game with Medium or High Texture Resolution
  8. Scan and Repair the Game Files on the Battle.net App
  9. Set the Task Priority of the Game to High from Task Manager
  10. Update Display Drivers
  11. Enable or Extend Page File/Virtual Memory
  12. Play Modern Warfare in Windowed Mode
  13. Disable Your Antivirus
  14. Check for Windows Updates
  15. Reinstall the Game

1. Run Modern Warfare as an Administrator

When a game runs, it has to write data on the hard drive to save files and run smoothly. Some parts of the hard drive need admin access to be overwritten. When the game can’t save files at that part of the hard disk, it stops responding and crashes.

In many instances, the Dev Error 6178 is also caused when Modern Warfare doesn’t have admin privileges. So, you can simply run it as an administrator to fix this fatal error.

  • Right-click the game icon on the desktop and choose ‘Properties.’ If you’re using a gaming client such as Steam or Battle.net, right-click its icon and select ‘Properties.’
  • Go to the Compatibility tab.
  • Checkmark the box next to ‘Run this program as an administrator.
Battle.net app properties open. Compatibility tab.
  • Click ‘Apply’ and ‘OK.’

2. Turn off In-Game Overlay from the NVIDIA Application and Other Overlay Programs

If your COD Modern Warfare keeps crashing with Dev Error 6178, the in-game overlay programs may blame you.

These overlay programs run on top of your game, providing features like recording videos, taking screenshots, and sharing with friends.

These features are useful, but if your PC is already struggling to play the game, it may crash when any overlay programs are running.

Common programs that have the in-game overlay feature enabled are NVIDIA GeForce Experience, Xbox Game Bar, MSI Afterburner, AMD Overlay, and Discord. If any of these apps run, their overlay feature may crash Modern Warfare. So, disable it and try again.

2.1 Disable In-Game Overlay from the NVIDIA Application

The In-Game Overlay option in the NVIDIA GeForce Experience application is enabled by default. Use these steps to disable it:

  • Turn off the game.
  • Launch the NVIDIA GeForce Experience desktop client.
  • Go to the Settings icon at the top.
  • In the ‘General’ tab, find the ‘In-Game Overlay’ switch, and turn it off.
NVIDIA GeForce Experience application main page
  • Save the configuration and close the app.
  • Restart your computer.

2.2 Disable Xbox Game Bar from Windows Settings

  • Open the Start menu and go to Settings.
  • Select Gaming’.
  • Go to ‘Xbox Game Bar’ and turn it off.
Xbox Game Bar settings on Windows 10

2.3 Turn off Discord Overlay

With Discord Overlay, you can text and voice chat while playing a game. If your game is crashing, try playing the game by disabling the Discord overlay.

  • Open Discord
  • At the bottom of the screen, select the Settings cogwheel icon next to your username.
  • From the left pane, go to ‘Game Overlay.’
  • Switch off ‘Enable in-game overlay
Game Overlay settings on Discord desktop client
  • R.’estart your computer.

3. Disable NVIDIA Highlights from the Game Settings

NVIDIA Highlights is a handy feature that automatically saves key moments of your gameplay that any gamer would want to be saved. You can also share the moments from the overlay on social media. But this also consumes computing power. If your game crashes and you see Dev Error 6178, disable NVIDIA Highlights.

Moreover, NVIDIA Highlights works when you enable it from the game and the NVIDIA GeForce Experience app. So, to disable it, you need to perform the same.

The NVIDIA ShadowPlay Highlights is part of the In-Game Overlay feature, and we have shown in Method 2 how to disable it.

Below, learn how to disable NVIDIA Highlights from Call of Duty Modern Warfare graphics settings.

  • Launch Call of Duty Modern Warfare.
  • Select the ‘Options’ button at the bottom of the screen.
  • Then, go to the ‘Graphics’ tab.
  • Find ‘NVIDIA Highlights’ and disable it.

4. Close Unwanted Programs While Running Modern Warfare

When many programs are running on your PC, they will also take up much RAM. Any graphics-heavy game requires a lot of RAM to work properly. So, when you play Modern Warfare while running many applications, your game may lag or crash and show Dev Error 6178 or any other error message. To fix this, close all the programs except the game.

  • Right-click the taskbar and select ‘Task Manager.
  • You’ll see a list of programs running. Right-click any unwanted program and select ‘End task.’
Task Manager on Windows 10
  • Do the same for all the unnecessary programs on the list.
  • Now, try running the game.

5. Disable V-Sync from the Game Settings and NVIDIA Control Panel

V-sync, also called Vertical Sync, is a useful graphics feature that enables your game to adjust its frame rate with your monitor’s refresh rate. It prevents screen tearing. So, you don’t see any multiple frames or a split display while playing your game.

VSync is known to be a preventative feature rather than an improvement feature. Because it limits the FPS when needed to keep the display from tearing. As it slows down the display performance, in some cases, it can also crash a game. So, try disabling V-Sync when troubleshooting the cause of Modern Warfare Dev Error 6178.

5.1 Disable V-Sync from COD Modern Warfare Settings

  • Open COD Modern Warfare
  • Go to ‘Option’ that’s at the bottom of the screen.
  • Switch to the ‘Graphics’ tab.
  • Disable ‘Sync Every Frame (V-Sync)
Graphics options on Call of Duty Modern Warfare

5.’.2 Turn Off V-Sync from NVIDIA Control Panel

If you’re using an NVIDIA GPU, you would have an NVIDIA Control Panel for managing your graphics card settings. Disable V-Sync from there as well.

  • Launch NVIDIA Control Panel.
  • On the side pane, go to 3D Settings > Manage 3D settings.
  • Choose ‘Program Settings’.
  • Click the ‘Add’ button and add COD Modern Warfare.
  • Scroll down and find ‘Vertical sync’ and set it to ‘off.’

6. Disable G-Sync from NVIDIA Control Panel

G-Sync is similar to V-Sync, but it’s considered a new update of V-Sync for NVIDIA users. It does the same thing – it prevents screen tearing. It can also take up a lot of processing power and slows your PC and game down. So, disable it to see if it was causing the Dev Error 6178 on Modern Warfare and Warzone.

  • Right-click on the desktop and select ‘NVIDIA Control Panel.’
  • Go to Display > Set up G-Sync.
  • Uncheck the box for ‘Enable G-Sync.’
  • Save settings and restart your computer.

7. Run the Game with Medium or High Texture Resolution

This is a surprising fix for Dev Error 6178 and game crashes on COD Modern Warfare. We usually recommend lowering the graphics settings to avoid errors and crashes.

But in the case of Texture Resolution, it’s the opposite. If you’re playing Modern Warfare on low Texture settings, the game may crash, and when you set it to normal, it may perform fine. Moreover, most gaming PCs can easily run the game on normal texture settings, so it’s nothing to be worried about.

  • Open COD Modern Warfare.
  • Go to ‘Options.’
  • Click the ‘Graphics’ tab.
  • Find the section ‘Details & Texture’.
  • Set ‘Texture Resolution’ to ‘Normal’.
Graphics options on Call of Duty Modern Warfare
  • Restart the game.

8. Scan and Repair the Game Files on the Battle.net App

A common reason for any game’s crashing often is its corrupted files. When the game files are corrupted, your game won’t be able to find the right files at the right time or won’t be able to save new settings to the files, which leads to game crashes.

You can easily scan and repair game files if you’re using the Battle.net desktop client for playing COD Modern Warfare or any other COD game.

  • Launch the Battle.net app.
  • Go to COD Modern Warfare.
  • Click the ‘Options’ menu and select ‘Scan and Repair.’
Options menu of Call of Duty Modern Warfare on Battle.net app
  • Please wait while the game scans and repairs its files.
  • Restart your computer when done.

9. Set the Task Priority of the Game to High from Task Manager

In some cases, Modern Warfare crashes due to the operating system’s insufficient resources available to the game. You can try setting the game’s CPU priority to High and see if it fixes the Dev Error.

  • Make sure the game is closed.
  • Right-click the taskbar and select ‘Task Manager. Or Open the Start menu, type ‘task manager’, and open the app.
  • Find the Modern Warfare process, right-click it, and choose ‘Go to details.
  • It will automatically switch you to the Modern Warfare process in the ‘Details’ tab of Task Manager.
  • Right-click the process you’re led to, hover your mouse cursor over ‘Set priority,’ and select ‘High.’
Settings the process priority of Call of Duty Modern Warfare via Task Manager
  • Run the game.

10. Update Display Drivers

When graphics drivers are out of date, any heavy game you’re playing may be prone to crashes. So, check for graphics driver updates if you’re experiencing Fatal Error Dev Error 6178 or any other error code on COD Modern Warfare.

10.1 Update Graphics Drivers from Device Manager

  • Open the Start menu, type ‘device manager, and open the first app.
  • Double-click ‘Display adapters.
  • It’ll show your graphics drivers.
  • Right-click your GPU and choose ‘Update driver.’
Device Manager on Windows 10. Updating display drivers
  • This will open a wizard. Choose ‘Search automatically for drivers.’
  • The system will search for your GPU driver updates online and install them if available.
  • If you have multiple GPUs, perform the same steps for each one.

10.2 Update Display Drivers from Windows Update

The default Windows updater also shows driver updates, so you can use it to try and update your graphics driver.

  • Click the Start menu, type ‘Windows update,’ and open the first app.
  • Choose ‘Check for updates.
  • Let it update and restart your computer when done.
  • Then, open the Windows updater again and check for updates.
  • Let it update again and reboot your computer.
  • Now, launch Windows updater and click ‘View optional updates.’
Windows Update on Windows 10
  • Click ‘Driver updates.
Optional updates options on Windows 10
  • C.’heckmark any available graphics driver updates and choose ‘Download and install.’
  • Restart your computer after the update.

10.3 Update Graphics Drivers from the Dedicated App from Your GPU’s Manufacturer

Many GPU manufacturers also provide an application for managing their graphics card settings. You can use it to update your graphics card drivers as well. We’ll use the method of updating drivers from the NVIDIA GeForce Experience application.

  • Install the application from NVIDIA. If it’s installed, launch it.
  • You may need to create a free account with NVIDIA to use all the app features.
  • Switch to the ‘Drivers’ tab.
  • Click ‘Check for Updates’ under your username.

11. Enable or Extend Page File/Virtual Memory

Page file or paging file or virtual memory on Windows reserves a part of your hard disk and uses it as RAM. This is useful when you frequently run programs that require a huge amount of RAM. So, Windows shifts some programs to virtual memory on your hard disk to keep everything running smoothly.

Call of Duty games relies a lot on Windows Page File. They may even crash if you’re not using Page File or if the capacity of Page File isn’t much. So, to fix Dev Error 6178 on COD Modern Warfare, Modern Warfare 2, or Warzone, enable Page File or extend the page file capacity from Windows Settings. Follow these steps:

  • Open the Start menu, type ‘Advanced system settings, and open the app.
  • Go to the ‘Advanced’ tab.
  • In the section ‘Performance’, click ‘Settings’.
System Properties on Windows 10. Advanced tab.
  • It’ll open another window. Switch to the ‘Advanced’ tab on it as well.
  • Under ‘Virtual memory,’ click ‘Change.
Performance Options on Windows 10. Advanced tab.
  • H.’ere, you can enable virtual memory by unchecking the box ‘Automatically manage paging file size for all drives.
  • You can then set or extend the paging file.
  • Click the local drive where you want to reserve some space for the paging file.
  • Now, click ‘Custom size.’ Enter an amount that you want. You can see the recommended amount at the bottom of the window. If you want to extend the paging file, enter an amount of 1024 MB or more than what’s already set.
Settings virtual memory on Windows 10/11
  • Once you enter the amount for initial size and maximum size, press the ‘Set’ button.
  • Click OK.
  • The window will close, and the previous open window will be visible. Click ‘Apply’ and ‘OK’ on it.
  • This will lead you to the system properties window that was opened. Click ‘Apply’ and ‘OK’ on it as well.
  • Restart your computer.

12. Play Modern Warfare in Windowed Mode

Mostly we run games in the full-screen mode, and they run fine. But if you frequently see Dev Errors and game crashes, try running COD Modern Warfare in windowed mode.

  • Launch the game.
  • Select ‘Options’ at the bottom of the screen.
  • Switch to the ‘Graphics’ tab.
  • Look at the first item on the list. Change ‘Display Mode’ to ‘Windowed.’
  • Restart the game.

13. Disable Your Antivirus

Some users reported that their overprotective antivirus was causing dev errors on COD Modern Warfare. When an antivirus blocks the game’s main executable file, it doesn’t run at all.

But sometimes, when any associated file is blocked, the game runs but crashes frequently. So, temporarily disable your antivirus to see if it fixes the issue.

13.1 Turn off Microsoft Defender Antivirus

  • Open the Start menu, type ‘Windows security, and launch the app. Or click the arrow button above the notification icons on the taskbar (beside or above the Wi-Fi and battery icons), and click the shield icon.
  • Choose ‘Virus & threat protection’.
Windows Security main window on Windows 10
  • Now, under ‘Virus & threat protection settings’, select ‘Manage settings’.
  • See the switch next to ‘Real-time protection and turn it off.

If MW still shows the error, turn the antivirus back on. But if MW begins working fine, enable the antivirus and exclude MW from it.

  • Open Windows Security and go to ‘Virus & threat protection.
  • Under ‘Virus & threat protection’, choose ‘Manage settings’.
  • Now, under ‘Exclusions’, select ‘Add or remove exclusions’.
  • On the next screen, choose ‘Add an exclusion.
  • Browse and select the Modern Warfare file.
  • Perform the same steps for other executable files in the COD Modern Warfare folder.
  • Restart your PC.

13.2 Turn off Third-Party Antivirus

Many third-party antivirus programs have an easy option to disable them right from the notification icon.

  • Right-click the icon of your antivirus on the taskbar. If it’s not visible, click the arrow button to see it.
  • Select the disable or turn off the option.
  • Confirm if asked for confirmation.

14. Check for Windows Updates

Many programs on Windows would not perform correctly if Windows isn’t updated frequently. This is because the updates have fixes for different bugs and also improvements. So, check for Windows updates often to avoid game crashes and errors.

  • Open the Start menu, enter ‘Windows update,’ and launch the first app.
  • Click the button ‘Check for updates.
  • It’ll check for updates and install them.
  • Restart your computer and run CODMW again.

15. Reinstall the Game

If you applied the above fixes and you’re still experiencing Dev Error 6178, the final option we have is to uninstall the game and then reinstall it.

This process differs based on where you bought Modern Warfare from. If you have a DVD of Modern Warfare or have the setup files on your hard drive, or you got it directly from Activision, use these steps:

  • Open the Start menu, add or remove programs, and launch the app.
  • Find Call of Duty Modern Warfare and uninstall it.
  • Restart your computer.
  • Install CODMW again from the disc, the game setup on your hard drive, or download it from Activision.

If you got COD Modern Warfare from the Battle.net app, find the steps for reinstalling MW below:

  • Launch the app and go to Call of Duty Modern Warfare.
  • Click ‘Options’ and choose ‘Uninstall Game.’
Options menu of Call of Duty Modern Warfare on Battle.net
  • Restart your computer.
  • Open Battle.net and go to COD MW.
  • Install the game.

The process of reinstalling Modern Warfare on Steam and other platforms would be similar.


To fix the Fatal Error Dev Error 6178 on COD Modern Warfare and Warzone, try every method provided in the guide.


What Does Dev Error Mean?

A Dev Error simply means an error encountered while running the program. There could be any reason for the issue. Usually, Dev Errors on COD are accompanied by some digits that show an approximate guess of the cause of the issue. For example, Dev Error 6068 means something is wrong with the graphics adapter or settings.

Why Do I Keep Getting Dev Errors On COD?

If you’re frequently getting one or different Dev Errors on COD, the reasons could be:
– Corrupted game files
– The virtual memory/paging file is not set or set at low
– The graphics card is out of date
– G-Sync and V-Sync are turned on.
– Texture Resolution on the game’s graphics options is set at low

What Is The Cause Of Dev Error Warzone?

There are different causes of Dev Error on Warzone.
– The game is running on high graphics
– V-Sync is on
– The in-game overlay is enabled (NVIDIA Highlights, Discord Overlay)
– Warzone game files are corrupted
– GPU drivers are out of date
– The game doesn’t have admin privileges

How Do I Fix The Dev Error On Modern Warfare?

You can fix different Dev Errors on Modern Warfare by following these methods:
– Turn off V-Sync from game settings
– Set the process priority of your game to high from Task Manager
– Scan and repair your game files
– Enable or increase virtual memory
– Run the Modern Warfare executable file as an administrator
– Disable in-game overlay settings and programs