MW3 Dev Error 841 | How To Fix "Dev Error 841"

Don't worry, you aren't the only one having problem with MW3 right now. We also experienced Dev Error 841 in Modern Warfare 3, here is how we fixed it.

MW3 Error Code
Trying to play MW3? Getting Dev Error 841 instead? Here's our advice. | © Activision

We get it - you want to enjoy Modern Warfare 3, but you've just been hit with Dev Error 841. Don't worry this is one of the easiest bugs to fix in MW3. Here is a guide on how to fix Dev Error 841.


What Causes Dev Error 841 In MW3?

Dev Error 841 seems to be a simple in-game crash and is not related to your account or the servers, so luckily it is very easy to fix. They haven't mentioned this bug yet on their official channel for emergency issues, and so you shouldn't get your hope up for a patch that will stop this issue coming back, but you can at least resolve it now.

We recently had Dev Error 841 ourselves and we were able to resolve the problem with our own solution.

How To Fix Error Code In Modern Warfare 3
Looking to fix an MW3 error? You aren't the first and you won't be the last. | © Activision

How To Fix Error Code Dev Error 841 In Modern Warfare 3

As with all basic crash errors in CoD, we can effectively just restart the game, and that should resolve the problem. Just follow these steps:

  1. Close Call of Duty completely:
    1. PC: Right-click on "Call of Duty" from the taskbar and select "Close" from the menu.
    2. Xbox: Press the Xbox button in the center of your screen. Highlight "Call of Duty" from the mini-guide on the left. Press the Menu button and then select quit from the menu.
    3. PlayStation: Press the PS button in the center of the controller. Select the "Switcher" (second option from the left on the hotbar). Highlight "Call of Duty". Press the Start button to bring up a dropdown menu and select "Close Game".
  2. Re-open Call of Duty.

And there you have it, a short guide on what causes Dev Error 841 and how you can fix it. Now get back out there and enjoy the grind (and if you don't know what weapon to use, here is our tier-ranking of every weapon in Modern Warfare 3).

Jon Ramuz

Jon has a BA and MA in English Literature, and as senior content manager for EarlyGame has written over 1,500 articles. He focuses on Call of Duty, for casual and competitive audiences, and also writes about Apex, Battlefield and XDefiant....