Why doesn't this work OnGUI.button(new Rect(cordx,cordy,sizex,sizey),Inv[i].icon))

I have this
public class InvUI : MonoBehaviour
{ public Texture2D inv_small;// i have set an image in the inspector
int btpx,btpy;
int btsx,btsy;
public class Item{
int value;
public Texture2D icon;
Item()
{value=0;

}
public int get_value(){ return value; }
public Texture2D get_icon(){ return icon; }

public void edit_value(int temp){
value = temp;
}
public void edit_icon(Texture2D temp){
icon = temp;
}
}
Item[] Inv =new Item[100];
void Start(){
for(int x=0;x<18;x++)
Inv[x].edit_icon(inv_small);
}
//as a nested class inside my main one; and this:
void OnGUI(){

GUI.Button (new Rect (btpx, btpy, 50, 50), Inv[1].icon);
GUI.Button (new Rect (btpx + btsx, btpy, 50, 50), inv_small);
GUI.Button (new Rect (btpx + btsx + btsx, btpy, 50, 50), inv_small);
}
void Update(){
//here i set values for btp i bts variables
}
}



and this doesnt work - doenst display buttons but it runs ... however if i change [Inv[1].icon / Inv[1].get_icon()] to just [inv_small] in the script it works just fine

 

Aren't you getting a bunch of NullReferenceExceptions? You never create any Item objects. You have only created an array that can store 100 Item, but not added any Item to it. So Inv[1] is null and thus you can't get an icon from it.