Hello MeGaBooM,
It's very hard to find why this happens.
I also did a map, which crashed too. But my friend fixed it.
There was just a think what he deleted from my map and the map worked then fine (I had luck).
We didn't knew that just a thing was the reason for the crash.

If you didn't worked hard on your map, then just start a new again. Compile and test your map every 5-10 minutes to find what the map crashes.