How to solve IndexOutOfRangeException? - unity3d

Question

I have some error related to IndexOutOfRangeException. The number of errors is over 200 and the error comes up when I play the game.
Error shown like this:
IndexOutOfRangeException: Array index is out of range. GameController.OnGUI () (at Assets/MicroRacers Assets/Scripts/GameController.js:67)
Here is the code of my game controller.
var CheckPoints:Transform[];
var LapsToWin:int = 5;
var PointsPerPlace:Array = new Array(8,4,2,1);
var CountDownToStart:float = 5;
var Items:Transform[];
var ItemCopy:Object;
var SpawnTime:Vector2 = Vector2(5,10);
private var SpawnTimeCount:float = 0;
var MaximumItems:int = 5;
private var ItemCount:int = 0;
private var FinishPlace:int = 0;
private var Players:int = 1;
var RaceEndDelay:float = 5;
//~ function Awake()
//~ {
//~ Application.targetFrameRate = 30;
//~ }
function Start()
{
SpawnTimeCount = Random.Range(SpawnTime.x, SpawnTime.y);
}
function Update ()
{
if ( SpawnTimeCount > 0 )
{
SpawnTimeCount -= Time.deltaTime;
}
else if ( ItemCount < MaximumItems )
{
SpawnTimeCount = Random.Range(SpawnTime.x, SpawnTime.y);
ItemCount++;
ItemCopy = Instantiate(Items[Mathf.Floor(Random.Range(0, Items.length - 1))], CheckPoints[Mathf.Floor(Random.Range(0, CheckPoints.length - 1))].position + Vector3.up * 0.3, Quaternion.identity);
ItemCopy.transform.Translate(Vector3.right * Random.Range(-3,3), Space.Self);
}
if ( Players == 0 )
{
RaceEndDelay -= Time.deltaTime;
if ( RaceEndDelay <= 0 )
{
Application.LoadLevel("end");
}
}
}
//This script displays the HUD, with current weapon, ammo left, Health, Shield, and score
var GUIskin:GUISkin; //The skin gui we'll use
var CountdownTextures:Texture2D[];
private var CountdownTextureIndex:int = 0;
function OnGUI()
{
GUI.skin = GUIskin; //The skin gui we'll use
if ( CountDownToStart > Time.timeSinceLevelLoad )
{
GUI.DrawTexture(Rect( (Screen.width - CountdownTextures[Mathf.Round(Time.timeSinceLevelLoad)].width) * 0.5, (Screen.height - CountdownTextures[Mathf.Round(Time.timeSinceLevelLoad)].height) * 0.5, CountdownTextures[Mathf.Round(Time.timeSinceLevelLoad)].width, CountdownTextures[Mathf.Round(Time.timeSinceLevelLoad)].height), CountdownTextures[Mathf.Round(Time.timeSinceLevelLoad)]); //Draw the HUD texture
}
}

Answer 1

Mathf.Round(Time.timeSinceLevelLoad) is just bigger CountdownTextures array size.
Maybe try adding this:
Debug.Log("Index: "+Mathf.Round(Time.timeSinceLevelLoad)+", Array size: "+ CountdownTextures.Length);
And you should see that index is bigger than size.
You can also add kind of safety check inside if, something like this:
if(Mathf.Round(Time.timeSinceLevelLoad) < CountdownTextures.Length && <your second statement>)