When I start play and try to move my player my enemy stops walking

Questions & Answers
1

Problem with the Enemy movement:
when I start play and try to move my player my enemy stops walking. Same script worked before but i don’t know what happened this time

Send help pls

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Enemy : PhysicsObject
{
    [Header("Attributes")]
    [SerializeField] private int attackPower = 10;
    private int direction = 1;
    public int health = 100;
    private int maxHealth = 100;
    [SerializeField] private float maxSpeed;
    [SerializeField] private LayerMask rayCastLayerMask; //Which layer do we want the raycast to interact with?
    [SerializeField] private Vector2 rayCastOffset; //Offset from the center of the raycast origin
    [SerializeField] private float rayCastLength = 2;

    [Header("References")]
    private RaycastHit2D rightLedgeRaycastHit;
    private RaycastHit2D leftLedgeRaycastHit;
    private RaycastHit2D rightWallRaycastHit;
    private RaycastHit2D leftWallRaycastHit;


    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
   public void Update()
    {
        targetVelocity = new Vector2(maxSpeed * direction, 0);

        //Check for right ledge!
        rightLedgeRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x + rayCastOffset.x, transform.position.y + rayCastOffset.y), Vector2.down, rayCastLength);
        Debug.DrawRay(new Vector2(transform.position.x + rayCastOffset.x, transform.position.y + rayCastOffset.y), Vector2.down * rayCastLength, Color.blue);
        if (rightLedgeRaycastHit.collider == null) direction = -2;

        //Check for left ledge!
        leftLedgeRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x - rayCastOffset.x, transform.position.y + rayCastOffset.y), Vector2.down, rayCastLength);
        Debug.DrawRay(new Vector2(transform.position.x - rayCastOffset.x, transform.position.y + rayCastOffset.y), Vector2.down * rayCastLength, Color.green);
        if (leftLedgeRaycastHit.collider == null) direction = 1;

        //Check for right wall!
        rightWallRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x, transform.position.y), Vector2.right, rayCastLength, rayCastLayerMask);
        Debug.DrawRay(new Vector2(transform.position.x, transform.position.y), Vector2.right * rayCastLength, Color.red);
        if (rightWallRaycastHit.collider != null) direction = -2;

        //Check for left wall!
        leftWallRaycastHit = Physics2D.Raycast(new Vector2(transform.position.x, transform.position.y), Vector2.left, rayCastLength, rayCastLayerMask);
        Debug.DrawRay(new Vector2(transform.position.x, transform.position.y), Vector2.left * rayCastLength, Color.magenta);
        if (leftWallRaycastHit.collider != null) direction = 1;

        //If health < 0, destroy me
        if (health <= 0)
        {
            Destroy(gameObject);
        }
    }


    //If I collide with the player, hurt the player (health is going to decrease, update the UI)
    void OnCollisionEnter2D(Collision2D col)
    {
        if (col.gameObject == NewPlayer.Instance.gameObject)
        {
            //Hurt the player, then update the UI!
            NewPlayer.Instance.health -= attackPower;
            NewPlayer.Instance.UpdateUI();
        }
    }
}