如何修复索引超出范围。 必须为非负数且小于集合的大小。

我对其进行了编码，以便它显示一张卡片，但它没有，
代码：

   public List<card> displayCard = new List<card>();
    public int displayId;

    public int id;
    public string cardName;
    public int cost;
    public int power;
    public string cardDescription;

    
    public Text nameText;   
    public Text costText;
    public Text powerText;
    public Text descriptionText;
  


    


    // Start is called before the first frame update    
    void Start()
    {
        displayCard[0] = CardDatabase.cardList[displayId];
    }

    // Update is called once per frame
    void Update()
    {
         id = displayCard[0].id;
         cardName = displayCard[0].cardName;
         cost = displayCard[0].cost;
         power = displayCard[0].power;
         cardDescription = displayCard[0].cardDescription;
       

       nameText.text = " " + cardName;
       costText.text = " " + cost;
       powerText.text = " " + power;
       descriptionText.text = " " + cardDescription;
    }
}

I have the cards on a different script

What I have tried:

Changing the card id etc. Rewriting it incase i forgot something, idk what esle to do