Script not working, help please

Questions & Answers
1

So this is kinda the continuation of this thread: Use of unassigned variable? Script from script reference - Unity Answers which I already got help and the error disappeared but the script doesn’t works so I’ve decided to make a new thread for it, this is my script:
using UnityEngine;
using System.Collections;

public class EnemyScript : MonoBehaviour {

	public float health = 100;
	public float speed = 100;
	
	public GameObject[] gos;
	public GameObject closestPlayer = null;
	public float distance;
	
	void FixedUpdate(){
		transform.LookAt(closestPlayer.transform.position);
		FindClosestEnemy();
	}
	
	GameObject FindClosestEnemy() {
        gos = GameObject.FindGameObjectsWithTag("Player");
        distance = Mathf.Infinity;
        foreach (GameObject go in gos) {
            Vector3 diff = go.transform.position - transform.position;
            float curDistance = diff.sqrMagnitude;
            if (curDistance < distance) {
                closestPlayer = go;
                distance = curDistance;
            }
        }
        return closestPlayer;
    }
}

The script isn’t finding the closest Player, so I’m getting this error: UnassignedReferenceException: The variable closestPlayer of ‘EnemyScript’ has not been assigned.
You probably need to assign the closestPlayer variable of the EnemyScript script in the inspector.
EnemyScript.FixedUpdate () (at Assets/Scripts/EnemyScript.cs:14)

Help me please, and thanks in advance

2

well now you need an if check to see if your closest enemy is null or not…

 void FixedUpdate(){
       if(closestPlayer != null)
       {
            transform.LookAt(closestPlayer.transform.position);
       }
       FindClosestEnemy();
    }