I need help with a NullReferanceException problem

Questions & Answers
1

I was following a guide to make a simple game and followed everything almost perfectly but for some reason i get 3 seperate NullReferanceException’s

NullReferenceException: Object reference not set to an instance of an object
enemyPatrol.Start () (at Assets/scripts/enemyPatrol.cs:12)

NullReferenceException: Object reference not set to an instance of an object
enemyPatrol.Update () (at Assets/scripts/enemyPatrol.cs:21)

and

NullReferenceException: Object reference not set to an instance of an object
enemyPatrol.Update () (at Assets/scripts/enemyPatrol.cs:21)
UnityEditor.Toolbar:OnGUI()

Here’s the script it’s coming from

using UnityEngine;

using System.Collections;

public class enemyPatrol : MonoBehaviour {

public Transform [] patrolPoints;

public float moveSpeed;

private int currentPoint;

// Use this for initialization
void Start () 
{
	transform.position = patrolPoints [0].position;
	currentPoint = 0;

}

// Update is called once per frame
void Update () {
	
	
	if (transform.position == patrolPoints [currentPoint].position)
	{	
		currentPoint++;//++ adds 1 to amount
	}

	if (currentPoint >= patrolPoints.Length) 
	{
		currentPoint = 0;
	}
							
	transform.position = Vector3.MoveTowards (transform.position, patrolPoints [currentPoint].position, moveSpeed * Time.deltaTime);

}

}

It’s attached to an enemy cube wich just has to move around but when i press play it just keeps pausing it and showing the errors mentioned above. If there is any more info i should give to help please tell me. Thanks!

2

public Transform patrolPoints;

You probably didn’t fill this list with gameObjects in the inspector. The code is not robust and crashes when there isn’t at least one item in the list.