NullReferenceException: Object reference not set to an instance of an object

Questions & Answers
1

I have 2 different scripts. 1 of them has int variable count and the other one goes and changes it’s value. But I get this error. Can you check it?

First Script:

using UnityEngine;
using System.Collections;

public class Spawn : MonoBehaviour 
{
    public GameObject monsterPrefab; // Set this in inspector to the monster prefab.

    public float Delay;
    public int count;
    public float canSpawn;

    void Update()
    {
        if (Time.time >= canSpawn)
        {
            if (count < 3)
            {
                Instantiate(monsterPrefab, transform.position, transform.rotation);
                count++;
                canSpawn += Delay + Time.time;
            }
        }
    }



}

Second Script:

using UnityEngine;
using System.Collections;

public class Health : MonoBehaviour
{
    public float health;

    Spawn script;
    
    private bool _damagedealth = false;

    private GameObject target;

    void Start()
    {
        health = 100;
        target = GameObject.FindGameObjectWithTag("Player");
        script = GetComponent<Spawn>();
    }

	void Update () 
    {
        if (health <= 0)
        {
            Destroy(this.gameObject);
            script.count -= 1;
        }
	}
2

I think it is meant to be like this:

    target = GameObject.FindGameObjectWithTag("Player");
    script = target.GetComponent<Spawn>();