How to fix the code, attack the bot and damage the player - unity3d

Question

I got an error when I finished writing the code
The type or namespace name 'Player' could not be found (are you
missing a using directive or an assembly reference ?)
An error pops up, I checked everything, nothing works, here is the code, I installed everything and the tag on the player does not work. I checked the name of the player, rewrote the code, but it doesn't work. I wanted the bot to turn on the attack animation and deal damage to the player.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Enemy : MonoBehaviour
{
private float timeBtwAttack;
public float startTimeBtwAttack;
public int health;
public float speed;
public GameObject deathEffect;
public int damage;
private float stopTime;
public float startStopTime;
public float normalSpeed;
private Player player;
private Animator anim;
private void Start()
{
anim = GetComponent<Animator>();
player = FindObjectOfType<Player>();
normalSpeed = speed;
}
private void Update()
{
if(stopTime <= 0)
{
speed = normalSpeed;
}
else
{
speed = 0;
stopTime -= Time.deltaTime;
}
if(health <= 0)
{
Destroy(gameObject);
}
transform.Translate(Vector2.left * speed * Time.deltaTime);
}
public void TakeDamage(int damage)
{
Instantiate(deathEffect, transform.position, Quaternion.identity);
health -= damage;
}
public void OnTriggerStay2D(Collider2D other)
{
if (other.CompareTag("Player"))
{
if(timeBtwAttack <= 0)
{
anim.SetTrigger("attack");
}
else
{
timeBtwAttack -= Time.deltaTime;
}
}
}
public void OnEnemyAttack()
{
}
}