问如何修复错误CS8803？我认为这可能与.NET 6.0有关，但我知道什么呢？

EN

class Wizard
{
    public static string name;
    public static string spell;
    public static float experience;
    public static int slots;

    public Wizard(string _name, string _spell)
    {
        name = _name;
        spell = _spell;
        slots = 2;
        experience = 0f;
    }

    public void CastSpell()
    {
        if (slots > 0)
        {
            Console.WriteLine($"{name} casted {spell}.");
            slots--;
            experience += 0.5f;
        }
        else
        {
            Console.WriteLine($"{name} is out of spells!");    
        }

        static void Meditate() //Used static void because public didn't work for some reason?
        {
            Console.WriteLine($"{name} meditates and regains all their spells!");
            slots = 2;
        }
    }
}
 
Wizard wizard1 = new Wizard("Wiz Name", "Spellum lazyum"); 
wizard1.CastSpell();