Multidimensional GameObject Arrays

Hi - so i'm having a problem with my multidimensional array.

I need to sort my field in an array sorted by: rows[]

 rows[0] = gameTile[1,2,3,4,5,6];
 rows[1] = gameTile[1,2,3,4,];

And so on.

This is the code:

 function OnLevelWasLoaded()
 {
     levelWon = false;
     temporaryGameTiles = GameObject.FindGameObjectsWithTag("Game Tile");
     temporaryRows = GameObject.FindGameObjectsWithTag("Row");
     temporaryStartIndicators = GameObject.FindGameObjectsWithTag("Start Indicator");
     touchIndicator = GameObject.Find("Touch Indicator");
         
     for(var v=0; v < temporaryRows.length; v++)
     {    
         var a = v+1;
                 
         //gameTiles[v] = new Array();
         
         //var gameTiles : GameObject[];
                         
         for(var u=0; u <temporaryGameTiles.length; u++)
         {
             for(var i=0; i < temporaryGameTiles.length; i++)
             {
                 var b = u+1;
                 
                 if(temporaryGameTiles[i].transform.name == "Game Tile "+a+"."+b)
                 {
                     rows[v,u] = temporaryGameTiles[i];
                                         
                 }
             }
         }
       }

my row variable is defined as: var row : GameObject[,];

The error i get is: NullReferenceException: Object reference not set to an instance of an object GameScript.OnLevelWasLoaded () (at Assets/Scripts/GameScript.js:96)

Theres nothing wrong with temporaryGameTile[i]; i have debugged this many times.

Please help :D