NullPointer :(

Can you help me with this please!

Code:

public class Main extends JavaPlugin{
    public static File f;
    public static FileConfiguration cfg;
   
    public void onEnable() {
        saveDefaultConfig();
        Main.f = new File("plugins/Bewerbung", "config.yml");
        Main.cfg = YamlConfiguration.loadConfiguration(f);
        Bukkit.getConsoleSender().sendMessage("§c Dies ist ein Bewerbungsplugin füur Durchrasten.de");
        Bukkit.getConsoleSender().sendMessage("§c Coded by Jack.");
        Bukkit.getConsoleSender().sendMessage("§c Das Plugin wurde aktiviert.");
       
        //CMD
        this.getCommand("invsee").setExecutor(new CMDInvsee());
        this.getCommand("setspawn").setExecutor(new CMDSetSpawn());
        this.getCommand("spawn").setExecutor(new CMDSpawn());
        this.getCommand("godmode").setExecutor(new CMDGod());
        this.getCommand("navi").setExecutor(new CMDComp());
       
       
        //Listener
        PluginManager pm = Bukkit.getServer().getPluginManager();
        pm.registerEvents(new Join(), this);
        pm.registerEvents(new Quit(), this);
        pm.registerEvents(new Interact(), this);
        pm.registerEvents(new InventoryInteract(), this);
        pm.registerEvents(new Godmode(), this);
    }
    public void onDisable() {
        Bukkit.getConsoleSender().sendMessage("§cDas Plugin wurde deaktiviert.");
    }

}

 

What's at line number 40?

 

Can you be so kind and quote that line for me?