Cast function crashes then an activator casts something on player

[Kythrius]

Are there any funny limitations on the cast function?

 

This crashes:

		set x to "player"->getpos x
	set y to "player"->getpos y
	set z to "player"->getpos z
	set z to z + 20
	aaaFireStormSource->position,x,y,z,0
	aaaFireStormSource->Cast aaaFireStormDamage player

 

x,y,and z are floats, aaaFireStormSource is an activator, and aaaFireStormDamage is a fireball spell.