I have an issue with the co-op. I know that if you don't have enough cabins then the error "No free slots on servers" The issue is I have the farmhouse and one cabin (farmhouse for me and cabin my friend) and we were playing for a few hours earlier. we wanted to continue playing so I started the server again, they joined and it came with the error (the one I mentioned earlier) "No free slots on servers" I have never had this issue before playing co-op. I have attached the save file as well. EDIT: Solved. It was an issue with steam.