Please Help With Script

using UnityEngine; using System.Collections;

public class Enemy : Character {

 private IEnemyState currentState;

 public GameObject Target { get; set; 

 // Use this for initialization
 public override void Start () 
 {
     base.Start ();

     ChangeState (new IdleState ());
 }
 
 // Update is called once per frame
 void Update () 
 {
     currentState.Execute ();
 }

 public void ChangeState(IEnemyState newState)
 {
     if (currentState != null)
     {
         currentState.Exit ();
     }

     currentState = newState;

     currentState.Enter (this);
 }

 public void Move()
 {
     MyAnimator.SetFloat("speed", 1);

     transform.Translate (GetDirection () * (movementSpeed * Time.deltaTime));
 }

 public Vector2 GetDirection()
 {
     return facingRight ? Vector2.right : Vector2.left;
 }

 void OnTriggerEnter2D(Collider2D other)
 {
     currentState.OnTriggerEnter (other);
 }

}