Scare plugin

Hey Spigot !

I've tried to make an Scare plugin. I've written a code, that unfortunately doesn't work. I was trying to find the answear on stacko**rflow, but no-one really helped me. I hope, that you could help me, so my code'll work.

Sorry for any grammar mistakes, I'm not from English talking countries.

Code (Text):

package me.maz0.scare;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.Sound;
import org.bukkit.block.Block;
import org.bukkit.block.Sign;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

import net.md_5.bungee.api.ChatColor;

public class Main extends JavaPlugin implements Listener {
   
    public void onEnable() {
        Bukkit.getServer().getPluginManager().registerEvents(this, this);
        Bukkit.getLogger().info("Scare plugin has been enabled");
        Bukkit.getLogger().info("Scare plugin by Maz0");
    }
   
     @SuppressWarnings("null")
    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
         Player p = (Player)sender;
         if (cmd.getName().equalsIgnoreCase("scare") && sender instanceof Player) {
             if(args.length == 0) {
                 p.sendMessage(ChatColor.RED +"You must specify a command !");
                 
        Player t = Bukkit.getServer().getPlayer(args[2]);
       
        if(t == null) {
            p.sendMessage(ChatColor.RED + "Could not find a player named " + ChatColor.YELLOW +  args[2] + " !");
             FileConfiguration config = getConfig();
             p.sendMessage(ChatColor.RED + "Invalid arguments, try /scare help");
         if (args[1].equalsIgnoreCase("help") && sender instanceof Player) {
             t.sendMessage("/scare help displays this help");
             t.sendMessage("/scare signs shows signs with texts (1-3)");
             t.sendMessage("/scare scream screms at player");
         if (args[1].equalsIgnoreCase("signs") && sender instanceof Player) {
             Block block = t.getLocation().subtract(0, 1, 0).getBlock();
             @SuppressWarnings("unused")
            Material type = block.getType();
             block.setType(Material.SIGN);
             Sign sign = (Sign) block.getState();
             sign.setLine(0, config.getString("Sign1"));
             Block block2 = t.getLocation().subtract(1, 0, 0).getBlock();
            @SuppressWarnings("unused")
            Material type2 = block.getType();
             block2.setType(Material.SIGN);
             Sign sign2 = (Sign) block.getState();
             sign2.setLine(0, config.getString("Sign2"));
             Block block3 = t.getLocation().subtract(1, 0, 1).getBlock();
             @SuppressWarnings("unused")
             Material type3 = block.getType();
             block3.setType(Material.SIGN);
             Sign sign3 = (Sign) block.getState();
             sign3.setLine(0, config.getString("Sign3"));
        if (args[1].equalsIgnoreCase("scream") && sender instanceof Player) {
            t.playSound(t.getLocation(), Sound.FUSE, 2F, 1F);
            t.addPotionEffect(new PotionEffect(PotionEffectType.SLOW, 60, 1));
                        } else {
                            p.sendMessage(ChatColor.RED + "Invalid arguments, try /scare help");
                        }
                     }            
                 }    
             }
         }
    }return true;
}}

 

Okay, I won't ask anymore and I'll try to find the error myself.

Thanks