for ( var i:int = 0 ; i < 1; i++) { for ( var j:int = 0 ; j < 1; j++) {

 if (shape[j][i] == 0 )
 {
  pencil.graphics.beginFill(0);
  pencil.graphics.drawRect(10,10,5,5);
  pencil.graphics.endFill();

 }

}

}

i am trying to run this code where shape is an array 2*2

gives an error

ReferenceError: Error #1069: Property 0 not found on Number and there is no default value. at Main()

need help