unity中，GetComponent方法中出现“不可访问，因为它有一定的保护级别的问题”

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

public class playerattack : MonoBehaviour
{
    private void Update()
    {

        if (Input.GetMouseButtonDown(0))
        {
            Attack();
        }
      
       
    }
    public float speed;
    public void adjustment(Collider2D _main) 
    {
        move pc = _main.GetComponent<move>();
        speed = pc.moveSpeed;
    }
    
    private void Attack() 
    {
        
        Vector2 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        float rotZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;//rad2deg==弧度制转角度制
        transform.rotation = Quaternion.Euler(0, 0, rotZ);
        transform.GetChild(0).gameObject.SetActive(true);
       
    }
   
        
}

这个是本体

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


public class move : MonoBehaviour
{
   public Rigidbody2D rb;
    public float moveH, moveV;
    public float moveSpeed=5f;
    // Start is called before the first frame update


    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update()
    {
        Speed(moveH, moveV);

        
    }
   
  public void FixedUpdate()
    {
        rb.velocity = new Vector2(moveH, moveV);
    }
    public void Speed(float _moveH,float _moveV)
    {
        _moveH = new move().moveH;
        _moveV = new move().moveV;
        moveH = Input.GetAxis("Horizontal") * moveSpeed;
        moveV = Input.GetAxis("Vertical") * moveSpeed;
        if (moveH > 0)
            transform.eulerAngles = new Vector3(0, 0, 0);
        if (moveH < 0)
            transform.eulerAngles = new Vector3(0, 180, 0);

    }

}

这个是引用的函数的脚本

这个报错？