Thank you Dennis for your reply.
I assume you are playing Civ6. Based on your reply, I tried first start a game in Online mode, then move save file to Hot-seat folder. But when try to load the game in Hot-seat mode, I cannot start game due to lack of some DLC contents. (I didn’t buy all of the DLC contents.)
I tried again with a vanilla version, disable all DLC content, but still could not get rid of this error.
Did you and all of your friends have all the available DLC contents installed (Civilization VI - New Frontier Pass) ?