Array with game object: object reference not set to an instance of an object

Could you be more specific about exactly where the for-loop is? By the looks of things, you're rebuilding the entire array every iteration! Could you tell us where the brackets are (since I think that's the important detail, here)?

Ok I will post the whole code but it's quite some of it I think.

var tilePrefab : GameObject;

var y : int = 5; var x : int = 5;

var initialColor : Color;

var tileGrid : int[,]; var tileList : GameObject[,];

 function Start (){

tileGrid = new int[y, x]; tileList = new GameObject[y,x]; rand$$anonymous$$ap();

for (var i : int = 0;i < y; i++) { for (var j : int = 0; j < x; j++) { tileList[j,i] = Instantiate (tilePrefab, Vector3(j, i, 0), Quaternion.identity);

   if(tileGrid[i,j]<15)
   {
       tileList[i,j].material.color = Color.green;
       }
   else if(tileGrid[i,j]<18)
   {
       tileList[i,j].renderer.material.color = Color.blue;
       }
   else if(tileGrid[i,j]<20)
   {
       tileList[i,j].renderer.material.color = Color.gray;
       }
   else if(tileGrid[i,j]<22){
       tileList[i,j].renderer.material.color = Color.cyan;
       }
   else
   {
       tileList[i,j].renderer.material.color = Color.yellow;
   }
       
       
   
   if (i == y/2 && j == x/2)
   {
       //print("Found middle of the map");
     cameraPosition= tileList[i,j].transform.position; // get the tile position...
     cameraPosition.z = Camera.main.transform.position.z; // but keep the camera z 
     Camera.main.transform.position = cameraPosition; // move camera to the position
     tileList[i,j].renderer.material.color = Color.magenta;

   }
 }

} }

function OnGUI () { var e : Event = Event.current; if (e.is$$anonymous$$ouse){ if($$anonymous$$eyCode.$$anonymous$$ouse2 ){ mousePositon = Vector3(Input.mousePosition.x,Input.mousePosition.y,Input.mousePosition.z); cameraPosition = Vector3(Input.mousePosition.x,Input.mousePosition.y,-25.0); Camera.main.transform.position = cameraPosition; Debug.Log("$$anonymous$$ouse position is:"+mousePositon); Debug.Log("Camera position is:"+cameraPosition); }; };