The problems with Call of Duty: Warzone are numerous. We have a lot of dissatisfied players reporting on several bugs. One of the most frustrating bugs is certainly the Dev Error 6039.
Fix Warzone Dev Error 6039 On PS4, PS5, PC & Xbox
In the case that the Dev Error appears on your console, you first must turn off the console and turn it on after a while. This means that you also need to unplug the power cord and plug it in again after 1 minute.
If you have a problem with a dev error that appears if you run the game after Rest Mode, go to Options and in the Graphics section, find the On-Demand Texture Stream. Set it to “Off” as this may cause problems.
In addition, there may be an update you needed. Check and install if there are any new updates for the game.
If nothing solves the Dev Error, uninstall and reinstall the game. You can do this by going into your PS library then find Call of Duty: Warzone and re-install it.
It is also advisable to free up memory from your storage; or you may also try installing the game on another hard drive.
This also applies to the PC version. It is certainly a bad option due to the size of the file to be downloaded, but it is the one thing you must do.