Stop resource load

When i load an instance with : UnityEngine.Resources.Load unity load infinite clone of the object.
How to stop the load of the object?

This is the code:

Code (csharp):

1.  
2. function Start() {
3.    var oggetto = new Array();
4.    oggetto = fileread("hero.txt");
5.    var i : int = 0;
6.    print((oggetto.length)-1);
7.    while(oggetto.length!=i+1){
8.    print(oggetto[i]);
9.       enemy = Instantiate(UnityEngine.Resources.Load(oggetto[i]));
10.       //enemy = Instantiate(UnityEngine.Resources.Load(oggetto[i],GameObject));
11.       i++;
12.       if(oggetto.length==i)
13.         break;
14.       }
15.       enemy = null;
16.       DestroyImmediate(enemy);
17. }
18.  

I try with enemy=null and with destroy, and this stop the loading of the objet, but unity continue to try to load the null object and return "Null Reference Expection..."

Thank you! =)

 

Ok, resolved:

i edit the function CreateEnemy()

Code (csharp):

1.  
2. function CreateEnemy() {
3.       if(oggetto.length!=j+1){
4.       var newEnemy = Instantiate(enemy, Vector3(0,0,0), Quaternion.identity);
5.       }              
6. }
7.