I can't create a save method using playerprefs, what should I do?

Question

Unity

Swears at how I call the key. Namely, on LvlNomer, he writes that it does not exist in this context. How to declare a key name then?

public void Save()
    {
        string key = “LvlNomer”;
        PlayerPrefs.SetInt(key, this.lvl);
        PlayerPrefs.Save();
    }

Answer 1

Answer from user GavriKos:
In the line string key = “LvlNomer”; incorrect quotes, that was the problem.