NHF – new heroes for Heroes V 3.1.

Here's the problem: I go to single-player, scenarios, any map, load it, and I get this message: "Single-player mode is not supported. To play against the computer, select multiplayer mode and set the opponent to AI." After that, the message appears, and I automatically lose. I go to multiplayer, but after loading, it immediately kicks me out of the game without a message. Without the mod, this doesn't happen! With the mod, it's like this...(((( I don't know what to do.