"exe_err_mss_init_failed" (typically associated with error codes like 150) is a Miles Sound System (MSS) initialization failure. It usually occurs when the game cannot properly communicate with your audio hardware or when core sound driver files are missing or corrupted. Microsoft Learn Top Solutions to Fix MSS Init Failed Update or Reinstall Audio Drivers
Close these applications completely via the System Tray (bottom right corner of your screen) or Task Manager before launching the game. If the game launches successfully, you know one of these apps was the culprit. Call of duty exe err mss init failed 150
: Right-click Call of Duty > Properties > Installed Files > Verify integrity of game files . If the game launches successfully, you know one
: The game may lack the necessary rights to access system-level audio components. How to Fix the Error How to Fix the Error