NullReferenceException problem

hello i am making a game following a tutorial. i was here:

3. Unity3d Tutorial - Enemy AI 1/2 - YouTube

i was trying to make a line between my player and the enemy but it doesnt show up, i did exactly as he did and i got this.

UnityEngine.Transform.get_position () (at C:/BuildAgent/work/6bc5f79e0a4296d6/Runtime/ExportGenerated/Editor/BaseClass.cs:771)
EnemyAI.Update () (at Assets/hach and slash scripts/EnemyAI.cs:26)

please someone help me!

btw here is the enemy AI code:

using UnityEngine;
using System.Collections;

public class EnemyAI : MonoBehaviour {
	public Transform target;
	public int moveSpeed;
	public int rotationSpeed;
	private Transform myTransform;
	void awake() {
		myTransform = transform;

	// Use this for initialization
	void Start () {
		GameObject go  = GameObject.FindGameObjectWithTag("Player");
		target = go.transform;
	// Update is called once per frame
	void Update () {
		Debug.DrawLine(target.position, myTransform.position, Color.yellow);
		// look at target
		myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position, myTransform.position), rotationSpeed * Time.deltaTime);

the error came in this line:
Debug.DrawLine(target.position, myTransform.position, Color.yellow);

I think you need to change your awake() to Awake(), to override the method.

I am guessing your FindGameObjectWithTag() returned null and therefore target is null.