Inventory array add error

Well I've used this exact command before and I never recieved an error so I assume its somewhere else in the script.

The Error:

 Assets/Scripts/BaseGirlControl.cs(121,64): error CS1061: Type `UnityEngine.GameObject[]' does not contain a definition for `Add' and no extension method `Add' of type `UnityEngine.GameObject[]' could be found (are you missing a using directive or an assembly reference?)

The Code.

 using UnityEngine;
 using System.Collections;
 
 [AddComponentMenu("Camera-Control/Mouse Look")]
 public class BaseGirlControl : MonoBehaviour {
     // Health & Heat
     
     public int maxhealth = 100;
     public int curhealth = 100;
     private float healthbarlength;
     
     public int maxheat = 100;
     public int curheat = 100;
     private float heatbarlength;
     
     public Transform GameController;
     
     
     // movement
     
     public float animSpeed = 1.5f;
     public float speed = 10.0f;
     public float RotationSpeed = 100;
     private Animator anim;
     
     // in hand items
     
     public string pickupTag;
     private Transform pickuploc;
     private Transform rightPalmloc;
     private bool RightHandEquip;
     public bool collideweapon;
     
     // Non in-hand items
     
     private RaycastHit hit;
     private Ray ray;
     private bool rendermenu;
     
     public GameObject[] InventorySlots = new GameObject[3];
     
     // Use this for initialization
     void Start () {
         pickupTag = null;
         anim = GetComponent<Animator>();    
         RightHandEquip = false;
         collideweapon = false;
     }
 
     
     // Update is called once per frame
     void Update () {
         HandlesGUI hg = (HandlesGUI)GameController.GetComponent("HandlesGUI");
         if (hg.Rendermenu == true)
         {
             rendermenu = true;
         }
         else
         {
             rendermenu = false;
         }
         AddjustCurrentHealth(0);
         AddjustCurrentHeat(0);
         float h = Input.GetAxis("Horizontal");
         float v = Input.GetAxis("Vertical");
         anim.SetFloat("Speedz", v);            
         anim.SetFloat("Speedx", h);
         anim.speed = animSpeed;
         if (Input.GetMouseButton(1)) 
         {
         }
         else
         {
             if(rendermenu == false)
             {
                 transform.Rotate(0, Input.GetAxis("Mouse X"), 0 * Time.deltaTime * speed);
             }
         }
         
         
         
         // Handles weapons / In hand items
         
         
         if (Input.GetButton("InteractionKey"))
         {
             if (collideweapon == true)
             {
                 if (pickupTag != null)
                 {
                     pickuploc = GameObject.FindWithTag(pickupTag).transform;
                     pickuploc.GetComponent<WeaponControl>().ispickedup = true;
                     rightPalmloc = GameObject.FindWithTag("GrippingHand").transform;
                     pickuploc.transform.parent = rightPalmloc.transform;
                     RightHandEquip = true;
                 }
             }
         }
         if (Input.GetButton("DropWeaponKey"))
         {
             if (RightHandEquip == true)
             {
                 pickuploc = GameObject.FindWithTag(pickupTag).transform;
                 pickuploc.GetComponent<WeaponControl>().ispickedup = false;
                 RightHandEquip = false;
             }
         }
         
         // Handles Clicking in gui mode to pick up items
         
         if(rendermenu == true)
         {
             ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             if(Input.GetButtonDown("Fire1"))
             {
                 if(Physics.Raycast(ray,out hit,20))
                 {
                     Debug.Log(hit.collider.tag);
                     if(hit.collider.tag == "Item")
                     {
                         InventorySlots.Add(hit.collider.gameObject);
                     }
                 }
             }    
         }
     }
     void OnGUI ()
     {
         // Health system
         if (rendermenu == true)
         {
             GUI.Box(new Rect(10, 10, 120, 20), "Health");
             GUI.Box(new Rect(10, 30, healthbarlength, 20), curhealth + "/" + maxhealth);
             
             GUI.Box(new Rect(10, 50, 120, 20), "Heat");
             GUI.Box(new Rect(10, 70, heatbarlength, 20), curheat + "/" + maxheat);
         }
     }
     
     // Health system
     
     public void AddjustCurrentHealth(int adj) {
         curhealth += adj;
     
         if(curhealth < 0)
             curhealth = 0;
         
         if(curhealth > maxhealth)
             curhealth = maxhealth;
         
         if(maxhealth < 1)
             maxhealth = 1;
         
         healthbarlength = (Screen.width / 2) * (curhealth / (float)maxhealth);
         
         if(curhealth == 0)
             Application.LoadLevel("MainMenu");
     }
     
     public void AddjustCurrentHeat(int adjh) {
         curheat += adjh;
     
         if(curheat < 0)
             curheat = 0;
         
         if(curheat > maxheat)
             curheat = maxheat;
         
         if(maxheat < 1)
             maxheat = 1;
         
         heatbarlength = (Screen.width / 2) * (curheat / (float)maxheat);
         
         if(curheat == 0)
             Debug.Log("Heatcold");
     }
 }

Second stupid question today, sorry guys this will be my last. Thanks allot, I apologize for the trouble.