Array goes out of index - unityscript

Question

I have a problem in the below code:
var Directions : Vector3[]; //*
function FindNext(){
if(Set.length == 0){
Debug.Log("We're done.");
return;
}
var previous : Transform = Set[0];
var pScript : Cell = previous.GetComponent("Cell");
var next : Transform;
var nextScript : Cell;
var prevX : int = pScript.Position.x;
var prevZ : int = pScript.Position.z;
var randDirection : Vector3;
var randSeed : int = Random.Range(0,4);
var nextX : int;
var nextZ : int;
var counter : int;
do{
do{
randDirection = Directions[randSeed];
nextX = prevX+randDirection.x;
nextZ = prevZ+randDirection.z;
randSeed = (randSeed+1) % 4;
counter++;
if(counter > 4){
Set.RemoveAt(0);
previous.GetComponent.<Renderer>().material.color = Color.black;
yield WaitForEndOfFrame();
return;
}
}while(nextX < 0 || nextZ < 0 || nextX + 1 >= GridSize.x || nextZ + 1 >= GridSize.z);
next = GridArr[nextX,nextZ];
nextScript = next.GetComponent("Cell");
//nextScript.IsOpened = false;
}while(nextScript.IsOpened);
AddToSet(next);
DrawDebugLines(10, previous, next);
ClearWalls(previous, next);
yield WaitForEndOfFrame();
}
For some reason there's a problem with the array index, and I don't really know what it is.
Below is the error that I get:
IndexOutOfRangeException: Array index is out of range.
Grid+$FindNext$5+$.MoveNext () (at Assets/Scripts/Grid.js:74)
UnityEngine.MonoBehaviour:StartCoroutine_Auto(IEnumerator)
Grid:Update() (at Assets/Scripts/Grid.js:122)
I'm using UnityScript with Unity 5.

Answer 1

Well the solution was simple, like this program are running on Unity, the array that was Out of Range it's a public array with transforms, so to fix the problem, the only thing that need to do it's set the array values:
(0,1)(1,0)(1,1)(1,0)
This values are because the array must contain the four possible direction in a maze.