Cannot host Coop game

[TitanSwarm]

I am unable to host any coop game. When I select a map (e.g. Fort Clarke Assault) it shows a loading spinner at the bottom of the screen. After that 'preparing game files'. Then 'Downloading mapname'. And then it shuts down completely and doesn't give me feedback, error or something.

I googled some and found my log file. There i found the part where it seems to have went wrong (see attachment)

I tried following the link specified in the log where I downloaded the zip, extracted it and pasted the content in my maps folder. This did not seem to fix the issue either.

Things i can exclude:
- My game works fine, i am able to host and play normal multiplayer games through the Faf client

Things i have not tested yet:
- Joining someone else's coop game

I hope anyone knows a solution for this, I hope i didn't overlook an already given solution on the forum. if any more information is needed, i can provide it!