[Thakos89]

When I start a new game and the first turn of my party begins, the "Game over"-screen follows directly.
I`ve adjusted the conditions to win the game, set monsters on the map and the party-startposition,too.

I don`t know what to do.

[Dyhalto]

To get the game going, you need three basic things.
-Player characters
-Enemy characters
-Win Condition

Now, you say you set the party start position? Do you mean setting the [1], [2], etc?
On the very first map, you need to set actual units under player control, not just what the Insert button places. Future maps will use the [1], [2] to bring back previous units.

Also, it's not like RPGMaker2k where you have to Set Party Starting Position where you want to begin the game. The very first map is what will load first.