Game shouts down when playing a custom map

[Dennis07]

Hi everyone.
I have problem:
I created a mission for a frontline map and now I want to test it.
But everytime I start the map (even in real game), the editor/game shouts down.
In the editor, the common message Program will be terminated is shown, in game there is no dialog, except from the windows This program does not react anymore -message.
This does not happen directly after the mission launched, only about half to one minute later.
There are lots of units on the map, but most of them are not visible at the beginning.

Does anyone know help?
thx