How to fix Duhok-Guernsey in Call of Duty?

I keep getting a Duhok-Guernsey message in Call of Duty. The error keeps appearing… Please help!

Decision

The Duhok-Guernsey error in Call of Duty appears for several reasons, and the first of them is that you missed the update. You should restart the Blizzard game client or clear the application cache on consoles. After re-downloading, an update should be displayed, you install it and everything passes. Another option is that the servers are currently unavailable. This happens especially often when a new update is released. Just wait.

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