@star_light1 If you haven't already done so, I'd suggest that you & the others you play with download the missions you're going to play from the #getting-started channel of the Co-Op/Campaign Development Discord to ensure that you're running the most up-to-date mission files as I know there's ongoing issues getting them updated in the client & GitHub. After downloading the mission you're going to play, follow these steps to get the game going with the correct mission map. If you have further issues, then the best way to get help with a co-op/campaign mission would be to get your most recent game log & post in the #bug-reporting-general channel of that discord.