Object reference not set to instance,

Questions & Answers
1

Hey guys I have a small error from a (probably) small error but I just can’t figure it out.

GameObject FindClosestEnemy()   
     {
         // Find all game objects with tag Enemy
         targets = GameObject.FindGameObjectsWithTag("Player"); 
         float distance = Mathf.Infinity; 
         Vector3 position = transform.position; 
         // Iterate through them and find the closest one
         foreach (GameObject target in targets)  { 
             Vector3 diff = (target.transform.position - position);
             float curDistance = diff.sqrMagnitude; 
             if (curDistance < distance) { 
                 closestTarget = target; 
                 distance = curDistance; 
             } 
         } 
         return closestTarget;    
     }

 Vector3 FindClosestPath()
     {
        //Find closest of 4 positions to nearest target
         Vector3 trnsPos = transform.position;
	float distance = Mathf.Infinity; 
	positions[0] = trnsPos + Vector3.forward;
	positions[1] = trnsPos + Vector3.back;
	positions[2] = trnsPos + Vector3.left;
	positions[3] = trnsPos + Vector3.right;
         foreach (Vector3 position in positions){
             Vector3 diff = (closestTarget.transform.position - position);
             float curDistance = diff.sqrMagnitude; 
             if (curDistance < distance) { 
                 closestPosition = position; 
                 distance = curDistance; 
             } 
         }
         return closestPosition;
     }

I have two functions in one of them I’m calling the transform of that the object that it is attached to without error. However on the Vector 3 function I’m getting error when trying to do the same thing.

NullReferenceException: Object reference not set to an instance of an object Movement_Enemy.FindClosestPath () (at Assets/Scripts/Movement_Enemy.cs:85) Movement_Enemy.Update () (at Assets/Scripts/Movement_Enemy.cs:24)

This error is only happening while in playmode. If hope this question was written with enough clarity, thank you for you time.

2

My bad, line 85 is positions[0] = trnsPos + Vector3.forward;

Here’s the full script

using UnityEngine;
using System.Collections;

public class Movement_Enemy : MonoBehaviour {
	public const float stepDuration = 0.5f;
	private Coroutine playerMovement;
	private Animation MovementAnimation;
	private GameObject[] targets;
	private GameObject closestTarget;
	private Vector3[] positions;
	private Vector3 closestPosition;


	private void Start()
	{
		targets = GameObject.FindGameObjectsWithTag ("Player");
		MovementAnimation = GetComponentInChildren<Animation> ();
	}

	private void Update()
	{
		if (Movement.playerMovement != null) {
			FindClosestEnemy();
			FindClosestPath();
			print(closestTarget);
			positions[0] = transform.position + Vector3.forward;
			positions[1] = transform.position + Vector3.back;
			positions[2] = transform.position + Vector3.left;
			positions[3] = transform.position + Vector3.right;
			print(closestPosition);
		}

	}
	
	private IEnumerator Move(Vector3 direction)
	{

		print (direction); 
		if (direction == Vector3.left)
		{MovementAnimation.Play("MovementLeft");}
		if (direction == Vector3.right)
		{MovementAnimation.Play("MovementRight");}
		if (direction == Vector3.forward)
		{MovementAnimation.Play("MovementForward");}
		if (direction == Vector3.back)
		{MovementAnimation.Play("MovementBackward");}

		Vector3 startPosition = transform.position;
		Vector3 destinationPosition = transform.position + direction;
		float t = 0.0f;
		
		while (t < 1.0f)
		{
			transform.position = Vector3.Lerp(startPosition, destinationPosition, t);
			t += Time.deltaTime / stepDuration;
			yield return new WaitForEndOfFrame();
		}
		
		transform.position = destinationPosition;
		
		playerMovement = null;
	}

	GameObject FindClosestEnemy()   
	{
		// Find all game objects with tag Enemy
		targets = GameObject.FindGameObjectsWithTag("Player"); 
		float distance = Mathf.Infinity; 
		Vector3 position = transform.position; 
		// Iterate through them and find the closest one
		foreach (GameObject target in targets)  { 
			Vector3 diff = (target.transform.position - position);
			float curDistance = diff.sqrMagnitude; 
			if (curDistance < distance) { 
				closestTarget = target; 
				distance = curDistance; 
			} 
		} 
		return closestTarget;    
	}
	
	Vector3 FindClosestPath()
	{
		Vector3 trnsPos = transform.position;
		float distance = Mathf.Infinity; 
		positions[0] = trnsPos + Vector3.forward;
		positions[1] = trnsPos + Vector3.back;
		positions[2] = trnsPos + Vector3.left;
		positions[3] = trnsPos + Vector3.right;
		foreach (Vector3 position in positions){
			Vector3 diff = (closestTarget.transform.position - position);
			float curDistance = diff.sqrMagnitude; 
			if (curDistance < distance) { 
				closestPosition = position; 
				distance = curDistance; 
			} 
		}
		return closestPosition;
	}
}