Unity c# Object reference not set to an instance of an Object ( Shooting Script )

 using UnityEngine;
 using System.Collections;
 
 public class Weapon : MonoBehaviour {
 
 public string Name;
 public int RateOfFire;
 int ROF;
 public int Accuracy;
 public int Ammo;
 public Bullet Amunition;
 public PCP shootingPoint;
 [HideInInspector]
 public bool IsActive = false;
 
 void Start () 
 {
     ROF = 0;
 }
 
 // Update is called once per frame
 public void WeaponUpdate () 
 {
     if(ROF != 0)
     {
         ROF --;
     }
 }
 
 public void Shoot()
 {
     if(Ammo > 0 && ROF == 0)
     {
         shootingPoint.SendMessage("Create",Amunition);
         Ammo --;
         ROF = RateOfFire;
     }
 }

"Note : PCP is shortcut to Prefab Shooting Point".

I got this error in the shooting method in the line "shootingPoint.SendMessage" I just dont understand why ? and I have the Components at the objects I placed in the shootingPoint and the Ammunation , so what is wrong ??

Here is an image to prove I attached objects :

PCP code : using UnityEngine; using System.Collections;

 public class PCP : MonoBehaviour {
 
 /*
  * Prefab Creation Point
 */
 
     void Update () 
     {
     
     }
 
     public void Create(Bullet bullet)
     {
         Bullet clone;
         clone = (Bullet) Instantiate (bullet, transform.position, transform.rotation);
         clone.rigidbody2D.velocity = transform.TransformDirection (Vector2.right * bullet.Speed);
     }
 }