Unity keep crashing with StartCoroutine and yield

I have a "Cubez" prefab (in "Resources" folder) with "SomeScript" script attached.

SomeScript:

 #pragma strict
 
 function move(){
     yield WaitForSeconds(1.0);
 }

In my scene I have an empty GameObject with "GoScript" script attached.

GoScript:

     #pragma strict
     var test : CallSome;
     function Start () {
         test = new CallSome();
         test.instance = Instantiate(Resources.Load("Cubez", Transform),Vector3(0,0,0), Quaternion.identity) as Transform;
     }
      
     function Update () {
         if(test.go()){
             StartCoroutine(test.getAndMove());
         }
     }

Plus I have "CallSome" script with "CallSome" class (used by "GoScript" script).

CallSome

     #pragma strict
      
     class CallSome{
         var instance : Transform;
         var i : int;
        
         function CallSome(){
             i = 0;
         }
        
         function getAndMove(){
             var script : SomeScript = instance.GetComponent(SomeScript);
             yield script.move();
         }
        
         function go() : boolean{
             if(i < 6) i++;
             return i == 5;
         }
     }

My GoScript calls "StartCoroutine(test.getAndMove());" that calls "yield script.move();" and Unity crashes (before doing ANYTHING in move() function, neither an eventual Debug.Log("some") in the first line).

Why? Please help me :(