How to Fix COD Modern Warfare Dev Error 1109?

After updating the latest patch of Call of Duty: Modern Warfare PC game, users get a new error while launching the game. We know that this sounds crazy, but Modern Warfare and Warzone PC players are feeling sick with every new bug or error. The COD Modern Warfare Dev Error 1109 has been included on the list of dev errors. If you’re also experiencing the same, you’re not alone here. You can check out the guide on how to fix this particular error code.

Many users have started reporting on the Reddit and Activision Support forums that they get the same error code whenever they try to launch the game on a PC. Meanwhile, some affected players mentioned that reinstalling the full game or disabling Discord overlay has fixed their issues. But that may not be useful for all. So, here we’ve shared some possible workarounds to fix the Dev Error 1109 issue for most users.

How to Fix COD Modern Warfare Dev Error 1109?

First of all, make sure that your internet connection is working fine and stable enough. Once done, check out the game system requirements and whether your PC configuration is compatible or not. Now, without further ado, let’s jump into the guide below.

1. Restart your PC

Most of the time, rebooting the PC will fix the issue.

  • Click on Start > Click on the Power icon.
  • Select the Restart option, and the computer will reboot.

2. Delete Cache (

A corrupted cache file can also cause game launch or gameplay issues. It’s better to clear the cache once and check for the issue again.

  • Close Blizzard programs on your PC.
  • Press Ctrl+Shift+Esc to open the Task Manager and go to Processes.
    • If agent.exe is running or Blizzard Update Agent in Windows 10 is running, click on it to highlight it and then choose End Process to close properly.
  • Now, press Windows + R to open the Run dialog box.
  • Type %ProgramData% in the Run field and press Enter.
  • Right-click on the Blizzard Entertainment folder in the directory and select Delete.
  • Restart the launcher and restart the game.

3. Verify Game Files (Repair)

  • Launch the Blizzard app.
  • Next, click on the Modern Warfare game.
  • Select Settings under the game title.
  • Select Scan and Repair.
  • Next, click the Begin Scan and wait for the process to complete.
  • Once done, restart the Blizzard launcher and run the game.

4. Update Graphics Driver

  • Right-click on the Windows taskbar.
  • Select Device Manager from the list.
  • Click on the Display Adapter arrow to expand the list.
  • Right-click on the dedicated graphics card.
  • Select Update Driver > Click on Search automatically for updated driver software.
  • It will check for updated drivers online.
  • If available, it will automatically download and install drivers.
  • Once done, restart your PC and check for the issue again.

If your graphics driver is already updated, check the next method.

5. Check Windows Update

  • Click on Start > Click on the Settings menu (gear icon).
  • Select Update & Security > Click Check for updates under the Windows Update section.
  • If a new update is available, you should download and install it.
  • Most importantly, Windows 10 cumulative updates are quite necessary.
  • Once installed, restart your PC and run the game.

6. Remove all overlay application

The overlay apps offer useful features or options for pro gamers or multiplayer games. However, the overlay apps always run in the background, which eats memory a lot and also can occur Dev Errors. So, if you don’t use these features, you should disable the Nvidia GeForce Experience Overlay. Additionally, you can disable Discord Overlay, etc.

While Xbox Gamebar users can also disable it from the Start menu > Settings > Gaming > Record game clips, screenshots, and broadcasts using the Game bar. Additionally, you can go to Captures > Turn off Background recording.

That’s it, guys. We assume that you’ve found the guide useful. For any queries, you can comment below.

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