The error message "EXE ERR MSS Init Failed 150" suggests that there is an issue with the initialization of the game's executable. This error can occur due to various reasons, including:
Step-by-step troubleshooting (ordered, prescriptive) Call of duty exe err mss init failed 150
: This is a classic "legacy" fix. The Miles Sound System often fails if it doesn't detect an active audio input. Plug a microphone or headset into your 3.5mm jack before launching. Enable Stereo Mix : The error message "EXE ERR MSS Init Failed