Perfect inventory code giving errors? [C#]

I can't understand why this code is giving me so many errors, it seems perfectly fine to me but yet i'm getting errors on lines :

• 26

• 30

• 32

• 33

• 53

• 54

• 62

Can someone please help me figure out the problem?

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class InventorySys : MonoBehaviour
 {
 // Remade the code and took out most of the comments sense everything is self-explanitory -- to keep it sexy..
     public List<Items> Inventory;
     public Items[] playerInventory;
     public Rect inventoryWindow = new Rect (0,0,600,600);
     private RaycastHit drug;
     private Ray lord;
     
     void Awake ()
     {
         Inventory = new List<Items> (); // Needed to be initialized.
     }
 
     void Update ()
     {
         
         Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
         
         if (Input.GetButtonDown("Fire1")) { // If object on ground is clicked on -->
             
             if (Physics.Raycast(Ray,out drug, 20)) {
                 
                 for (int x = 0; x < playerInventory.Length; x++) { // Check the player's entire inventory to see if it already has the item -->
                     
                     if (drug.collider.tag == playerInventory[i].itemID.ToString()) { 
                         
                         Inventory.Add(playerInventory[i]); // Adding to our inventory.
                         Destroy(drug.collider.gameObject); // Once the player picks up the object, we destroy the object from the floor.
                     }
                 } 
             }
         }
     }
     
     
     
     
     // Really simple GUI code for testing purposes. 
     
     void insideInventory (int windowID) {
         
         int expandRec = 20;
         GUI.DragWindow(new Rect(0,0,600,20));
         
         for (int i = 0; i < Inventory.Count; i++){// Finding everything in solid inventory. The player inventory is for grabbing objects and fowarding them into the solid inventory.
         
             GUI.Button(new Rect(20, expandRec, 64, 65), Inventory[i].icon); // Creates small buttons with our icons on them.
             GUI.Label(new Rect(70, expandRec, 64, 65), Inventory[i].name);
             GUI.Label(new Rect(90, expandRec, 64, 200), Inventory[i].description);
           GUI.Button(new Rect(100, expandRec, 64, 65), "Power Level : " + Inventory[i].itemPowerLevel.ToString() + "Damage!");
     
             // You get the point.
     }
      }    
     
     void OnGUI() {
         InventoryWindow = GUI.Window(0, inventoryWindow, insideInventory, "Inventory Menu by XX!");
     }
     
 }
  

which is from a class like this :

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 [System.Serializable]
 public class Items {
 
 public string itemName; 
 public string itemDescription; 
 public int itemPowerLevel;
 public int itemDamage; 
 public int itemRange; // Don't know if this was needed, but whatever. EX : Kirito's Bow - Range : 500-600.
 public int itemID;
 public int itemPrice; 
 public GameObject attachObject;
 public Texture2D icon; // Attaching an icon.
 public Transform itemPrefab; // Prefab for item.
 
 public enum ItemGroup{ Weapon, Clothing, Potion, Quest, Recipe, MescItem } // Can't think of anything else.
 public ItemGroup itemCategory;
 
     // Constructors.
 
 /**
 public Items_X InvetoryCon = new Items_X(0, 0, 0, 0, 0); // Instance.
 
    public Items_X(int d, int r, int u, int g, int s) 
         {
             itemPowerLevel= d;
             itemRange = r;
             
             // ^ add on, if needed.
         }
         
         **/
 
     
 }