Help with Victory/defeat conditions

Im making my first MP map. Ive created single player maps b4, and never had a problem. I don't get the voctory/defeat conditions. Once i complete what the map shell, i run it (ctrl+f9) and as soon as it loads, it says, "player 1 victorious". but i didnt do anything. Ive tried setting the other 3 players to different types, like Human, Computer, ect... but it still does the same thing. Does the map have to be run in a real MP game? is it a bug? or am i just doin sumtin wrong?

Well, here's what your problem _probably_ is, but you could've just setup your triggers wrong. Look under the map initialization trigger. Do you have enforce melee victory/defeat conditions on? If so, that means if you have no buildings, you lose, or if your opponent has no buildings, they lose. Chances are you want to delete that.