they cant keep spawning unless the spawn area is the whole map
when they reach the size limit of the location, they stop spawning, but u can make it so that the "cannot create unit" error message comes out by using either bring at least or bring at most....

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Thats compleatly false, the location size doesn't effect the spawn area in the slightest.
Puni are you getting an error message with coordinates? If so write those numbers down, then devide them both by 32 and go to that place on map and delete/move those units.
Nozomu, the max units in the game is 1700 the max in the editor is 1650.