Missions to big?????

[sonicninja]

This afternoon i spent about an hour designing a mission around the falkland islands that involved about 14 ships (2 task forces) 2 air bases, and 4 subs.
I saved the mission and then ran the mission and all i get now when i run the mission is the game returns to desktop
Have i included too many assets or is there another problem involved?
Ive created my own missions before and had no trouble at all.