invalid cast exception, array of particle systems

Yes you are!

http://stackoverflow.com/questions/9559347/implicit-downcast-from-unityengine-component-to-unityengine-particleemitter

gochi7's full message :

#pragma strict

 static var charge : int = 0;
 var collectSound : AudioClip;
 //HUD
 var hudCharge : Texture2D[];
 var chargeHudGUI : GUITexture;
 //Generator
 var meterCharge : Texture[];
 var meter : Renderer;
 //$$anonymous$$atches
 private var have$$anonymous$$atches : boolean = false;
 var matchGUIprefab : GUITexture;
 private var matchGUI : GUITexture;
 var fireEmitters : ParticleEmitter[];
 var TextHints : GUIText;
 
 function Start ()
 {
     charge = 0;
 }
 
 function Update ()
 {
 
 }
 
 function CellPickup()
 {
     AudioSource.PlayClipAtPoint(collectSound, transform.position);
     charge++;
     chargeHudGUI.texture = hudCharge[charge];
     meter.material.mainTexture = meterCharge[charge];
     HUDon();
 }
 
 function HUDon()
 {
     if(!chargeHudGUI.enabled)
     {
         chargeHudGUI.enabled = true;
     }
 }
 
 function $$anonymous$$atchPickup()
 {
     have$$anonymous$$atches = true;
     AudioSource.PlayClipAtPoint(collectSound, transform.position);
     var matchHUD : GUITexture = Instantiate(matchGUIprefab, Vector3(0.15,0.1,0),transform.rotation);
     matchGUI = matchHUD;
 }
 
 function OnControllerColliderHit(col : ControllerColliderHit)
 {
     if(col.gameObject.name == "campfire")
     {
         if(have$$anonymous$$atches)
         {
             LightFire(col.gameObject);
         }
 
         else
         {
             TextHints.Send$$anonymous$$essage("ShowHint", "i could use this campfire to signal for help... \n if only i could light it");
         }
     }
 }
 
 function LightFire(campfire : GameObject)
 {
     fireEmitters = campfire.GetComponentsInChildren(ParticleEmitter);
     for(var emitter : ParticleEmitter in fireEmitters)
     {
         emitter.emit = true;
     }
     campfire.audio.Play();
     Destroy(matchGUI);
     have$$anonymous$$atches=false;
 }

i'm getting an error with my array of particle systems saying implicit downcasting from component to particle system on line 71 the exact error being : InvalidCastException: Cannot cast from source type to destination type.