Hi i am new in c# and unity and i dont know how to fix this error x.x

i realy hope you guys can help and explain me what i did wrong

The Errors

HealthHeartBar Code looks like this

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

public class HealthHeartBar : MonoBehaviour
{
    public GameObject heartPrefab;
    public float health, maxHealth;
    List<HealthHeartBar> hearts = new List<HealthHeartBar>();

    public void DrawHearts()
    {
        ClearHearts();

        float maxHealthRemainder = playerHealth.maxHealth % 2;
        int heartsToMake = (int)((playerHealth.maxHealth / 2) + maxHealthRemainder);
        for(int i = 0; i < heartsToMake; i++) 
        {
            CreateEmptyHeart();
        }
        for(int i = 0; i < hearts.Count; i++)
        {
            int HeartStatusRemainder = (int)Mathf.Clamp(playerHealth.health - (i*2), 0, 2);
            hearts[i].SetHeartImage((HeartStatus)HeartStatusRemainder);
        }
    }

public void CreateEmptyHeart()
{
    GameObject newHeart = Instantiate(heartPrefab);
    newHeart.transform.SetParent(transform);

    HealthHeart heartComponent = newHeart.GetComponent<HealthHeart>();
    heartComponent.SetHeartImage(HeartStatus.Empty);
    hearts.Add(heartComponent);
}
    public void ClearHearts()
    {
        foreach(Transform t in transform)
        {
            Destroy(t.gameObject);
        }
        hearts = new List<HealthHeart>();
    }
}

and my HealthHeart looks like this

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

public class HealthHeart : MonoBehaviour
{
  
  public Sprite fullHeart, halfHeart, emptyHeart;
  Image heartImage;

  private void Awake()
  {
    heartImage = GetComponent<Image>();
  }

  public void SetHeartImage(HeartStatus status)
  {
    switch (status)
    {
        case HeartStatus.Empty:
            heartImage.sprite = emptyHeart;
            break;
        case HeartStatus.Half:
            heartImage.sprite = halfHeart;
            break;
        case HeartStatus.Full:
            heartImage .sprite = fullHeart;
            break;
    }
  }
    
}


public enum HeartStatus
{
    Empty = 0,
    Half = 1,
    Full = 2,

}

so where is my misstake i need realy help.

i watched youtube videos, reddit dont find my misstake -.-

hope you can help me