HoM&M V: The Shadow of Death doesn't work in a local network; the save file is corrupted.

Hello, we decided to play "Tribes of the East" over a local network, and we didn't have any problems with the game or setting up the local network. The problem is this: During the game, I experienced a connection interruption, and our game was interrupted. When trying to load the save file in the game on my friend's computer, he received the message: "You are not mentioned in the save file of this game". We both have the save files. When my friend creates a room, I get the same message. I've searched the internet, but I haven't found anything helpful. I'm begging for help with this problem.