Out of bounds value?

//spells testing

function alignTerrain(%pos)
{
	%x = getWord(%pos, 0);
	%y = getWord(%pos, 1);
	%z = getTerrainHeight(%x SPC %y);
	%finalPos = %x SPC %y SPC %z;
	return %finalPos;
}

new decalData(purpleZodiac)
{
	sizeX = 2;
	sizeY = 2;
	textureName = "Tallion/data/special/zodiacs/purple.png";
	lifeSpan = 5000;
};

new decalData(blueZodiac)
{
	sizeX = 2;
	sizeY = 2;
	textureName = "Tallion/data/special/zodiacs/blue.png";
	lifeSpan = 5000;
};

function callZodiac(%player, %num)
{
	if(%num = 0)
	{
		%zodiac = new sgDecalProjector()
		{
			position = alignTerrain(%player.getPosition());
			datablock = "purpleZodiac";
		};
		MissionCleanup.add(%zodiac);
	} else {
		%zodiac = new sgDecalProjector()
		{
			position = alignTerrain(%player.getPosition());
			datablock = "blueZodiac";
		};
		MissionCleanup.add(%zodiac);
	}
}