I can't get the target block

Hey, I'm trying to make a thor kit, but I can't get the target block to make the lightning

Could you guys help me? Please, I will need it today

Code:

    @SuppressWarnings("deprecation")
    @EventHandler
    public void abThor(PlayerInteractEvent e){
         final Player p = (Player) e.getPlayer();
       
        if(e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK){
           
            if(p.getItemInHand().getType() == Material.WOOD_AXE){
               
                if(Main.thorc.contains(p.getName())){
                    p.sendMessage(ChatColor.RED + "O Thor está em cooldown");
                }else{
                   
                    p.getWorld().strikeLightning(p.getTargetBlock(null, 20).getLocation());
                    Main.thorc.add(p.getName());
                   
                    Main.plugin.getServer().getScheduler().scheduleAsyncDelayedTask(Main.plugin, new Runnable() {
                        public void run() {
                            Main.thorc.remove(p.getName());
                        }
                    },  20);
                }
               
            }
        }
    }

The error is in: p.getWorld().strikeLightning(p.getTargetBlock(null, 20).getLocation());

 

What is the error ?

 

It doesn't work

 

Cast the null to a Set<Byte>, because this method can take two types of containers, and null can be either of those

Edit: to a HashSet<Byte> or a Set<Material>, these are the two options.

 

Sorry, I didn't understand, What do I have to do?

 

Cast, do you know what casting means?

 

You should know some basic Java if you want to learn the bukkit API..

 

@ProjectGames0
Here's the spoon feed
p.getWorld().strikeLightning(p.getTargetBlock((HashSet<Byte>) null, 20).getLocation());

 

Why are you proud of that?

 

@mcdorli He's not going to get much farther without knowing how to cast so it's ok.
As long as I get a thank you your fine
@ProjectGames0

 

Maybe link him a page about cating? This only does, that he won't learn it, because he can just copy and paste it.

 

@VinexAx789

Yeah, If he doesn't have a basic understand of Java, you should definitely just spoonfeed him code. Surely he will just look at it and understand exactly what everything means
</sarcasm>

Please don't spoonfeed.

 

You forgot to add a <sarcasm> tag before your sentence, this xml code would throw an error.

 

Thank you guys!
Now it's working

I'll try to learn more about Java, and about casting.