Public variable giving me "null reference exception"

[zmar0519]

Hey, everyone. I’m working on an inventory code, but I haven’t gotten far because of a slight issue. Whenever I try to access my “items” variable(which is a separate class on another script with vars for an icon, a rect, an index, and an item(yet another script)), it gives me “Null reference exception: object reference not set to an instance of an object” and forfeits the function. I have no idea whats going on. Here’s the inventory code:

var headSlotItemType : ItemType;
var handLSlotItemType : ItemType;
var handRSlotItemType : ItemType;
var shirtSlotItemType : ItemType;
var pantsSlotItemType : ItemType;
var shoeSlotItemType : ItemType;
var headPos : Transform;
var handLPos : Transform;
var handRPos : Transform;

var slotSize : float = 50.0;
var slotSpacing : float = 10.0;

var headSlotPos : Vector2 = Vector2(195, 40);
var handLSlotPos : Vector2 = Vector2(50, 120);
var handRSlotPos : Vector2 = Vector2(195, 120);
var shirtSlotPos : Vector2 = Vector2(10, 190);
var pantSlotPos : Vector2 = Vector2(70, 190);
var shoeSlotPos : Vector2 = Vector2(130, 190);
var offset : Vector2 = Vector2(5, 15);

var backgroundGUIStyle : GUIStyle;
var textGUIStyle : GUIStyle;
var slotGUIStyle : GUIStyle;
var boxGUIStyle : GUIStyle;

var toggleKeys : KeyCode[] = [KeyCode.I];

var invWindowID : int = 0;

var defaultSlotIcon : Texture2D;

var commonColor : Color;
var uncommonColor : Color;
var rareColor : Color;


var items : ItemInfo[];

private var rects : Rect[];
private var curSelectedItemInfo : ItemInfo;
private var showInv : boolean = true;
private var nextAvailableSlot : int;
private var player : Transform;
private var full : boolean;
private var windowRect : Rect;
private var characterRect : Rect;

function Awake() {
	items = new ItemInfo[26];
	
	player = GameObject.FindWithTag("Player").transform;
	
	invDisplay = GetComponent(InventoryDisplay);
	
	rects = new Rect[26];
	
	SetRects();
}
function SetRects() {
	//The Individual Slot Rects
	var i : int;
	for(y = 0; y < 4; y++) {
		for(x = 0; x < 5; x++) {
			rects _= new Rect(slotSize*x + slotSpacing*(x) + offset.x, slotSize*y + slotSpacing*(y) + offset.y, slotSize, slotSize);_

•  	i++;*
  

•  }*
  

• }*

• //The Window Rect*

• windowRect = new Rect(10, 10, 300, 500);*

• //The Character Picture Rect*

• characterRect = new Rect(5, 40, 290, 200);*

• //Head Slot Rect*

• rects[20] = new Rect(headSlotPos.x, headSlotPos.y, slotSize, slotSize);*

• //Left Hand Slot Rect*

• rects[21] = new Rect(handLSlotPos.x, handLSlotPos.y, slotSize, slotSize);*

• //Right Hand Slot Rect*

• rects[22] = new Rect(handRSlotPos.x, handRSlotPos.y, slotSize, slotSize);*

• //Shirt slot Rect*

• rects[23] = new Rect(shirtSlotPos.x, shirtSlotPos.y, slotSize, slotSize);*

• //Pant Slot Rect*

• rects[24] = new Rect(pantSlotPos.x, pantSlotPos.y, slotSize, slotSize);*

• //Shoe Slot Rect*

• rects[25] = new Rect(shoeSlotPos.x, shoeSlotPos.y, slotSize, slotSize);*

• for(i = 0; i < 26; i++) {*
  items_.rectInWindow = rects*;
  }
  }
  function PickUpItem(newItem : ItemInfo) {
  CalculateNextAvailableSlot();
  items[nextAvailableSlot] = newItem;
  newItem.relativeItem.gameObject.transform.parent = transform;
  newItem.relativeItem.transform.position = transform.position;
  newItem.relativeItem.transform.rotation = transform.rotation;
  newItem.relativeItem.SetEquipped(true);
  newItem.relativeItem.gameObject.SetActiveRecursively(false);
  }
  function CalculateNextAvailableSlot()
  {
  var index : int;
  for(i = 0; i < items.length; i++)
  {
  if(items.relativeItem == null) {
  index = i;
  break;
  }
  }
  nextAvailableSlot = index;
  }
  function GetNextAvailableSLot() : int {
  return nextAvailableSlot;
  }
  function SetNextAvailableSlot(i : int) {
  nextAvailableSlot = i;
  }*_

function OnGUI() {
* if(showInv) {*
* windowRect = GUI.Window(invWindowID, windowRect, InventoryWindow, “Inventory”);*
* }*

}
function InventoryWindow(id : int) {
* GUI.DragWindow(Rect(0, 0, 10000, 1000));*
}
and here’s the code with the item info class on it:
enum ItemType
{
* Consumable,*
* Weapon,*
* Armor,*
* Clothing*
}

enum Rarity
{
* Common,*
* Uncommon,*
* Rare*
}

class ItemInfo {
* var iconTexture : Texture2D;*
* var indexInArray : int;*
* var relativeItem : Item;*
* var rectInWindow : Rect;*
}
Does anyone know what I’m doing wrong?
All help would be appreciated. Thanks!

[Bunny83]

I guess you set the item array in the inspector? In this case you shouldn't create the array yourself.

this line will recreate the whole array and deletes the old one:

items = new ItemInfo[26];

Furthermore all items in this new array will be null.

Unity creates the array and the containing classes for you when you edit the array in the inspector.

Just remove the line above and it should work ;)

[roamcel]

For what I understand of your code, since you’re not retrieving ItemInfo from a component, you need to declare its class as STATIC to be able to use it.
Unfortunately I don’t know the js syntax for static but on c# you write

public static class ItemInfo {
...