There is perhaps nothing more frustrating in modern gaming than sitting down to play after a long day, launching Call of Duty: Modern Warfare 3, clicking on "Multiplayer" or "Zombies," and being greeted by the dreaded notification: "Menu Content Not Available."
Solutions to the error
Restore Licenses: This is the most effective fix for "locked" content. Call of Duty: Modern Warfare 3 – How
Xbox: Power cycle the console by holding the power button for 10 seconds, unplugging for 30 seconds, and restarting. Null dereference or unhandled empty responses: Client code
Install All Add-Ons: The MW3 launcher often separates content into "packs." Navigate to Manage Game Content and ensure all multiplayer, campaign, and compatibility packs are fully installed. Advanced Troubleshooting Restore Licenses : This is the most effective
Go to your Library > Call of Duty > 3 dots (...) > View Product.
Further investigation is recommended to: