REALIZE THIS SHOULD BE A LAST DITCH EFFORT FIX AND HAPPENED TO WORK FOR ME THERE ARE MULTIPLE SOLUTIONS MAKE SURE TO WATCH UP TO 1:20 FOR BASIC EXPLANATION.
ANOTHER POSSIBLE EASIER FIX I DIDN’T TRY FROM COMMENTS

/”It turns out the issue was with my blizzard launcher. The game was installing incorrectly every time due to some bug. I just had to reinstall blizzard launcher then install cod again./”

This video I go over what worked for me after much trial and error to fix DEV ERROR 6036[ww_mp_mapname_am.ff] for Call of Duty Modern Warfare 2019
The beginning is really all you need for the fix but I go into more detail on the error symptoms with other videos that I had recorded. I hope this fix works for you and if it doesn’t just try another source as this bug seems to have multiple solutions. I will one day be uploading some game play clips Ive been saving but as I’m in college finding the time can be difficult.

Please take the opportunity to connect and share this video with your friends and family if you find it useful.