How to Fix Dev Error 6456 in Call of Duty Warfare and Warzone? - MiniTool

Call of Duty: Modern Warfare and Warzone players are encountering the frustrating Dev Error 6456, often accompanied by a DirectX unrecoverable error message. This guide provides several troubleshooting steps to resolve this issue. The root cause isn't always clear, so try each solution sequentially until the problem is solved.

Resolving Dev Error 6456 in Call of Duty

This error can interrupt gameplay in both Modern Warfare and Warzone. Because the cause isn't always obvious, there's no single fix. Work through these solutions one at a time.

Solution 1: Run as Administrator

Insufficient administrator privileges or temporary system glitches can trigger this error. Try running the game with elevated permissions.

1. Close the game and the Battle.net launcher.
2. Open Task Manager (right-click the taskbar). End any game-related processes (Blizzard Update Agent, Discord, etc.).
3. Right-click the Battle.net launcher and select "Run as administrator."
4. Relaunch the game.

Solution 2: Update or Roll Back Graphics Drivers

Driver incompatibility can cause Dev Error 6456. Try updating or reverting your graphics drivers.

Roll Back Drivers:

1. Open Device Manager (Win X).

2. Expand "Display adapters," right-click your GPU, select "Properties" > "Driver" > "Roll Back Driver."

   

Update Drivers:

1. Open Device Manager.

2. Expand "Display adapters," right-click your GPU, select "Update driver" > "Search automatically for drivers."

   

Solution 3: Disable Overlays

Conflicting or numerous overlays can trigger the error. Disable them:

• GeForce Experience: Launch GeForce Experience, go to "Settings," and disable "Share" under the "General" tab.
• In-Game FPS Counter: In the game's options, disable the FPS counter.
• Discord Overlay: Close Discord completely via Task Manager.

Solution 4: Clear and Reinstall Game Shaders

Corrupted shader caches (often after driver updates) can cause problems. Reinstall them:

1. In-game, go to "Options" > "Graphics" > "Restart Shaders Installation" > "Restart."

Solution 5: Verify Game File Integrity

Corrupted game files are a potential cause. Verify their integrity:

1. Open the Battle.net launcher, locate the game, and select "Settings" > "Scan and Repair."

Solution 6: Reinstall the Game

As a last resort, reinstall the game:

1. In Battle.net, uninstall the game.
2. Reboot your computer and reinstall from Battle.net.

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