Code For My Plugin Error

package me.telesew123.herobuilds;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Color;
import org.bukkit.FireworkEffect;
import org.bukkit.FireworkEffect.Type;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Firework;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.meta.FireworkMeta;
import org.bukkit.plugin.java.JavaPlugin;



public class Main extends JavaPlugin implements Listener {


	public void onEnable() {
		getLogger().info("HeroBuilds Enabled");
		Bukkit.getServer().getPluginManager().registerEvents(this, this);

	}

	public void onDisable() {
		getLogger().info("HeroBuilds Disabled");
	}

	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
		if(sender instanceof Player) {
			Player player = (Player) sender;
			if(cmd.getName().equalsIgnoreCase ("hub")) {
				String hub = "spawn " + player.getName();
				Bukkit.dispatchCommand(Bukkit.getConsoleSender(), "spawn" + player.getName());
				player.sendMessage(ChatColor.AQUA + "Teleporting To Hub");

			}

		}

		return false;

	}

	@EventHandler
	public void onPlayerJoin(final PlayerJoinEvent pje) {
		            Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
		            	public void run(){
		            		Firework f = (Firework) pje.getPlayer().getWorld().spawn(pje.getPlayer().getLocation(), Firework.class);
		            		FireworkMeta fm = f.getFireworkMeta();
		            		fm.addEffect(FireworkEffect.builder()
		            				.flicker(false)
		            				.trail(true)
		            				.with(Type.BALL)
		            				.with(Type.BALL_LARGE)
		            				.with(Type.STAR)
		            				.withColor(Color.AQUA)
		            				.withColor(Color.GREEN)
		            				.withFade(Color.BLUE)
		            				.build());
		            		fm.setPower(3);
		            		f.setFireworkMeta(fm);
		            	}
		            }, 20);
	}








}