Hows to assign an objects children to its LOD component?

Hello, I have trees with 2 lod levels. The trees work with a parent object (LOD group attached). This parent has 2 children (different tree objects). Im trying to find a way for my small LOD_Set script to set the parents children to its lod group component. So far I get an array index is out of range error. Line 13 //code attached

 #pragma strict
 
 var group : LODGroup;
 
 
 
 function Start () 
 {
 var childs : LOD[] = new LOD[2];
 var Lod0 : Renderer[] = new Renderer[2];
 
 Lod0[1] = gameObject.transform.GetChild(0).gameObject.GetComponent(Renderer);
 Lod0[2] = gameObject.transform.GetChild(1).gameObject.GetComponent(Renderer);
 
 childs[0].renderers = Lod0;
 
 group.SetLODS(childs);
 group.RecalculateBounds();
 }