Spawning activators via script?

[Campaigner]

I've looked over every aspect of the plasma effect, where it does the green glow, meltdown, and leaves a goo pile. I've made all the changes needed, including the shaders and custom mesh for the new pile. My problem lies in the script, which does not make any sense. I'm trying to make an addition to my recent mod that makes a weapon have a new shader effect when it kills someone, and mimics the plasma crit effect; gooification. Below is the script I am using for this;

 

ScriptName AAAARedPlasmaGooificationEffectScript

Float Timer
Short DoOnce

Begin ScriptEffectStart
if getisid nvcrmrhouse == 0
SetCriticalStage GooStart
PMS GooShader03
PMS GooShader04
Set Timer to 1.4
Set DoOnce to 0
endif
End

Begin ScriptEffectUpdate
If DoOnce == 0
	If Timer <= 0 
		AttachAshPile 3
		SetCriticalStage GooEnd
		Set DoOnce to 1
	EndIf
	Set Timer to (Timer - ScriptEffectElapsedSeconds )
EndIf
End

 

The line with "AttachAshPile" does not seem to work as well as I expected it to. GooShader03 and 04 are my custom ones, and they work fine ingame, but AshPile03, the custom mesh for the new goo pile, does not work. I don't want to change every goo pile in the game to red, just the one I made myself for a custom weapon. How would I go about getting my mesh to spawn instead of one of the ash pile or pile of goo (green)?