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

Questions & Answers
1

I am creating a dodge the blocks game where blocks are spawned in front of you and you move to dodge them. when the player has moved past a block, I want to delete the block so there wont be too much lag on mobile devices. If I don’t delete them, the game will get increasingly slower the further you go. This is the script that I am getting this error (line 16)
**
using UnityEngine;

public class Delete : MonoBehaviour {

    public GameObject player;
    public GameObject me;

    private void Awake()
    {
        player = GameObject.FindGameObjectWithTag("Player");
    }

    void Update () {
	
        if (player.transform.position.z > transform.position.z)
        {
            Invoke("DeleteBlock", 3);
        }

    }

    private void DeleteBlock()
    {
        Destroy(me);
    }
}

**

2

Possible FindGameObjectWithTag has not found the player. Try to set a link in the inspector.