DEV ERROR 6034 [wm_mp_......]

Hello @StaceyPonich, I hope everything is going well!

Thank you for reaching Microsoft Xbox Forum support!

I highly recommend following the troubleshooting steps here:

After each step try to see if the issue is fixed!

First, hold down the power button for about 10 seconds, until the console shuts off, then unplug the power cord and wait for 2 to 3 minutes before plugging it back in and turn on the Xbox.

If the issue persists, please select System > Settings > devices and streaming > blue ray > persistent storage > clear three times > restart console.

If you are still having the same issue, it’s possible that the local save for the game has become corrupted. If so, deleting the local save and re-syncing with the cloud might correct the problem.

First, delete the local save:

1. Press the Xbox button to open the guide and then select My games & apps > See all > Games.

2. Highlight the game title, and then press the Menu button on your controller.

3. Select Manage game and add-ons > Saved data.

4. Select Delete all to remove the local save of this game, then follow the prompts.

After you delete the local save, restart your Xbox:

1. Press and hold the Xbox button in the center of your controller.

2. Select Restart console, then follow the prompts.

After you restart your Xbox resync your saved games to the cloud. Your saved games are automatically stored in the cloud while you are connected to Xbox Live.

Try playing the game again to see if re-syncing with the cloud corrected the game problem.

If you are still encountering the same issue, please select System > Settings > System > Console info > Select Reset console > Choose reset and keep my games and apps.

I wish you a lovely day, and I hope this helps you out!

Kind Regards

Stay safe, and happy gaming

Thanks for this. I will give it a try and see what happens. It appears to be on certain maps. For example, this is what the error I receive looks like...

DEV ERROR 6034 [wm_mp_piccadily.ff]

DEV ERROR 6034 [wm_mp_emporium.ff]

You can fix this COD dev error, but solutions vary with devices. So, I would suggest following this complete guide that will help you to fix the error on all the devices: Fix COD Dev Error 6034

Same DEV ERROR 6034 code and I've tried all the recommendations and the error continues. Do I need to off load something and reinstall? Please advise.

Hey ! I was having this problem for certain maps for TWO months and this Fix works !!

-Turn on Xbox

-Click the start button over MW

-scroll down to manage games and add on

-click the add ons

-delete MP2 and multiplayer pack 3

-do NOT re install those two packs !!!

-restart console

-load up MW