The name 'gameObject' does not denote a valid type?

 //  LootableObject.js
 //  Make the GameObject "Lootable".
 //  This script will 
 //  Attach this script to any GameObject that is "Lootable"
  
 #pragma strict
  
 private var theInventoryItem : InventoryItem;                         //   The current contents of this lootable object
 private var thisLootableItem : gameObject;                       //  A reference to this instance of this script
 private var clicked : boolean;                                //   Trap for creating the current contents only once
 private var canLoot : boolean;                                //   Boolean to control TestDistance.
 private var playerTransform : Transform;                           //    A reference to the Player Transform
 private var thisTransform : Transform;
  
 var itemName : String;
 var itemIcon: Texture2D;
  
  
 private var Inventory;
  
  
 function Start () 
 {                                              //  Setup the initial states of the variables
     //itemName = the object name
     itemName = this.gameObject.name;
     //itemIcon will get selected in Unity
     //itemDescription as well
  
     var theInventoryItem = new InventoryItem();
     //Init thhe inventory item
     theInventoryItem.itemName = itemName;
     theInventoryItem.itemIcon = itemIcon;
  
     thisTransform = this.transform;
     playerTransform = gameObject.FindWithTag("Player").transform; 
     thisLootableItem = this.gameObject;
     clicked = false;
  
 }
  
  
 function OnMouseDown() 
 {                                                  
     Loot ();                                           
 }                                                  
  
 function Loot ()
 {
     if (!clicked) 
     {                                        //    If not yet clicked, check Loot Table
        clicked = true;
     }
  
     //Add the item to the inventory
     Inventory.AddItem(theInventoryItem);
     theInventoryItem = null;             //Set it to null
  
  
  
  
     //Destroy the game object
     Destroy(this.gameObject);
 }

This is a code for a GUI inventory. This is the code that goes on the items that you pick up in the game. It says The name 'gameObject does not denote a valid type ('not found'). When I click on the error it brings me to line 9. I`m new to scripting so this is a stupid question most likely.

Thanks!!!!!!