Why do I get an Argument Out of Range Exception when I use a multidimensional List?

Questions & Answers
1

/*
Instantiate(Resources.Load(“Blocks/EmptyBlock”)) as GameObject DOES return a GameObject
Something is happening whenever I Add() an element that throws the exception
This is my code:
*/

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Block : MonoBehaviour {
	public static List<List<List<GameObject>>> blockGrid; 

	void arraySetup(List<List<List<GameObject>>> blockArray, int rows, int cols, int depth) {
		blockArray[0][0].Add( Instantiate(Resources.Load("Blocks/EmptyBlock")) as GameObject );
		Debug.Log(blockArray[0][0][0].name);

	}


	void Start () {
		blockGrid = new List<List<List<GameObject>>>();
		arraySetup(blockGrid, 20,20,10);
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}
2

Each list needs be to instantiated separately:

List<List<List<GameObject>>> blockArray = new List<List<List<GameObject>>>();
for (int i = 0; i < rows; i++) {
    blockArray.add(new List<List<GameObject>>());
    for (int j = 0; j < cols; j++) {
        blockArray*.add(new List<GameObject>());*

for (int k = 0; k < depth; k++) {
blockArray*[j].add( Instantiate(Resources.Load(“Blocks/EmptyBlock”)) as GameObject);*
}
}
}