NullReferenceExeption problem

Unity Engine
1

Intro:
A car runs over a Pizza. It shall disappear, and ++ PizzaAmount
When PizzaAmount is greater than 0, you can click on Jump = P, and spawn a Pizza

There is no problem by make the Pizza Disapear, when you run over.

When i want to drop the pizza, this code is in used

function Update () {

 if(Input.GetButtonDown("Jump"))
     {
       MorePizza();
     }
}

function MorePizza (){
			if(PizzaAmount>0){
					var pizza = Instantiate(PizzaPrefab, GameObject.Find("carSpawn").transform.position, Quaternion.identity);
			       	PizzaAmount --;
			       	yield WaitForSeconds(1)
       		 
}
}

But when as soon PizzaAmount is greater than 1, and i press Jump, it gives me this error

NullReferenceException
PizzaHit+$MorePizza$30+$.MoveNext () (at Assets/Scripts/PizzaHit.js:16)
UnityEngine.MonoBehaviour:StartCoroutine_Auto(IEnumerator)
PizzaHit:Update() (at Assets/Scripts/PizzaHit.js:10)

I am hoping you could help me, and I am hoping that i am clearing it out right

2

Problem found, the spawn named were named Spawn, and not carSpawn.

New problem:

Getting the error

InvalidCastException: Cannot cast from source type to destination type.
PizzaHit+$MorePizza$30+$.MoveNext () (at Assets/Scripts/PizzaHit.js:17)
UnityEngine.MonoBehaviour:StartCoroutine_Auto(IEnumerator)
PizzaHit:Update() (at Assets/Scripts/PizzaHit.js:11)

3

Problem solved

I maked a gameObject Cube, remove the collider, and the mesh render. named that spawnPoint and used the code

var pizza = Instantiate(PizzaPrefab, GameObject.Find("spawnPoint").transform.position, Quaternion.identity);