AI moving Backwards along path

Hi, I am having trouble with my AI enemy moving along my path. The enemies are moving along the path in the correct direction but are however (problem) rotated the wrong way - sideways and backwards rather than facing forwards.
Credit: The code is from quill18creates youtube channel as I have been following the tutorial. link: https://www.youtube.com/watch?v=b7DZo4jA3Jo

C# Code
Enemy Attached Code:

using UnityEngine; using System.Collections;

public class Enemy : MonoBehaviour {

 GameObject pathGO;

 Transform targetPathNode;
 int pathNodeIndex = 0;

 public float speed = 5f;

 public float health = 1f;

 public int moneyValue = 1;

 // Use this for initialization
 void Start () {
     pathGO = GameObject.Find("Path");
 }

 void GetNextPathNode() {
     if(pathNodeIndex < pathGO.transform.childCount) {
         targetPathNode = pathGO.transform.GetChild(pathNodeIndex);
         pathNodeIndex++;
     }
     else {
         targetPathNode = null;
         ReachedGoal();
     }
 }
 
 // Update is called once per frame
 void Update () {
     if(targetPathNode == null) {
         GetNextPathNode();
         if(targetPathNode == null) {
             // No path left
             ReachedGoal();
             return;
         }
     }

     Vector3 dir = targetPathNode.position - this.transform.localPosition;

     float distThisFrame = speed * Time.deltaTime;

     if(dir.magnitude <= distThisFrame) {
         // Node Reached
         targetPathNode = null;
     }
     else {
         // Move Towards Node
         transform.Translate( dir.normalized * distThisFrame, Space.World );
         Quaternion targetRotation = Quaternion.LookRotation( dir );
         this.transform.rotation = Quaternion.Lerp(this.transform.rotation, targetRotation, Time.deltaTime*5);
     }

 }

 void ReachedGoal() {
     GameObject.FindObjectOfType<ScoreManager>().LoseLife();
     Destroy(gameObject);
 }

 public void TakeDamage(float damage) {
     health -= damage;
     if(health <= 0) {
         Die();
     }
 }

 public void Die() {
     GameObject.FindObjectOfType<ScoreManager>().money += moneyValue;
     Destroy(gameObject);
 }

}

Enemy Spawner Code:

using UnityEngine; using System.Collections;

public class EnemySpawner : MonoBehaviour {

 float spawnCD = 0.25f;
 float spawnCDremaining = 5;

 [System.Serializable]
 public class WaveComponent {
     public GameObject enemyPrefab;
     public int num;
     [System.NonSerialized]
     public int spawned = 0;
 }

 public WaveComponent[] waveComps;

 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
     spawnCDremaining -= Time.deltaTime;
     if(spawnCDremaining < 0) {
         spawnCDremaining = spawnCD;

         bool didSpawn = false;

         // Go through the wave comps until we find something to spawn;
         foreach(WaveComponent wc in waveComps) {
             if(wc.spawned < wc.num) {
                 // Spawn it!
                 wc.spawned++;
                 Instantiate(wc.enemyPrefab, this.transform.position, this.transform.rotation);

                 didSpawn = true;
                 break;
             }
         }

         if(didSpawn == false) {
             if(transform.parent.childCount > 1) {
                 transform.parent.GetChild(1).gameObject.SetActive(true);
             }
             else {
             }

             Destroy(gameObject);
         }
     }
 }

}

Please Help,