Problem with spawning script (ArmA 2 OA)

[undercoverbrother]

G'day everyone,

I've spent quite a while trying to write script to spawn 5 units. So far this what I've got:

_pos = getMarkerPos "MarkerOne"
_s1 = "Graves"
_s2 = "US_Delta_Force_SD_EP1";
_s3 = "US_Delta_Force_Medic_EP1";
_s4 = "US_Delta_Force_Night_EP1";
_plane = "C130J_US_EP1";

for [{_counter = 0}, {_counter < 5}, {_counter = _counter + 1}] do {
	_units = [_s1,_s2,_s3,_s4,_plane] select _counter;
	_spawngroup = [_pos, West, _units, [],[],[0.5,0.8],[]] call BIS_fnc_spawnGroup;
};

On my map I have a marker named "MarkerOne" and a functions module. I know there are a lot of threads on this already but none of them seem to work for me; which is really strange as they work for the people who post them . Please help.

thanks,