Solved Help! Strange error...

Hello everyone! I need some help.

In one of my classes, 'Utils' I create my general methods. I created a method called tpTimer(), its supposed to start a BukkitRunnable that counts to 3. What I'm trying to do is when a player sends the command "/spawn", the plugin executes the method tpTimer() and counts to 3, then teleports the player to the specified spawn location. Here is my code:

Utils.class:

Code:

package com.redtsch.RedHub.ServerCore;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_9_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;
import org.bukkit.scheduler.BukkitRunnable;

import net.minecraft.server.v1_9_R1.IChatBaseComponent;
import net.minecraft.server.v1_9_R1.IChatBaseComponent.ChatSerializer;
import net.minecraft.server.v1_9_R1.PacketPlayOutChat;
import net.minecraft.server.v1_9_R1.PacketPlayOutTitle;
import net.minecraft.server.v1_9_R1.PacketPlayOutTitle.EnumTitleAction;

public class Utils {

    Core core = Core.getInstance();

    private static Utils utils;

    public static Utils getInstance() {
        return utils;
    }

    public static void broadcastMessage(String message) {
        for (Player player : Bukkit.getOnlinePlayers()) {
            player.sendMessage(message);
        }
    }

    public static void sendBar(Player player, String message) {
        IChatBaseComponent icbc = ChatSerializer.a("{\"text\": \"" + message + "\"}");
        PacketPlayOutChat ppoc = new PacketPlayOutChat(icbc, (byte) 2);
        ((CraftPlayer) player).getHandle().playerConnection.sendPacket(ppoc);
    }

    public static void sendTitle(Player player, String titleMessage, String subtitleMessage) {
        PacketPlayOutTitle title = new PacketPlayOutTitle(EnumTitleAction.TITLE,
                ChatSerializer.a("{\"text\": \"" + titleMessage + "\"}"), 20, 40, 30);
        PacketPlayOutTitle subtitle = new PacketPlayOutTitle(EnumTitleAction.SUBTITLE,
                ChatSerializer.a("{\"text\": \"" + subtitleMessage + "\"}"), 20, 40, 30);
        ((CraftPlayer) player).getHandle().playerConnection.sendPacket(title);
        ((CraftPlayer) player).getHandle().playerConnection.sendPacket(subtitle);
    }

    @SuppressWarnings("deprecation")
    public static void tpTimer(Player player) {
        Bukkit.getServer().getScheduler().scheduleSyncRepeatingTask(Core.getInstance(), new BukkitRunnable() {
            int time;

            public void run() {
                player.sendMessage("Teleporting you to spawn, please wait 3 seconds.");
                time = 0;
                time++;
                if (time == 3) {
                    player.teleport(new Location(player.getWorld(), -131.5, 66, 218.5));
                    time = 0;
                }
            }
        }, 0, 20);
    }
}

CmdSpawn.class:

Code:

package com.redtsch.RedHub.ServerCore.Listeners.Commands;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import com.redtsch.RedHub.ServerCore.Core;
import com.redtsch.RedHub.ServerCore.Utils;

public class CmdSpawn implements CommandExecutor {

    Core core = Core.getInstance();
    Utils utils = Utils.getInstance();

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (label.equalsIgnoreCase("spawn")) {
            if (!(sender instanceof Player)) {
                sender.sendMessage("You must be a player to use this command.");
                return false;
            }
            Player player = (Player) sender;
            Utils.tpTimer(player);
        }
        return false;
    }
}

Please help if you can! =P

Oops! Forgot my stacktrace..

Here it is:

Code:

[16:25:08 INFO]: redtsch issued server command: /spawn
[16:25:08 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'spawn' in plugin RedHub v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[bukkit.jar:git-Bukkit-f326992]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[bukkit.jar:git-Bukkit-f326992]
    at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:624) ~[bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1298) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1158) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(SourceFile:37) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(SourceFile:9) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) [bukkit.jar:git-Bukkit-f326992]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_60]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_60]
    at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:679) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:361) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:635) [bukkit.jar:git-Bukkit-f326992]
    at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:539) [bukkit.jar:git-Bukkit-f326992]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_60]
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
    at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[bukkit.jar:git-Bukkit-f326992]
    at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftScheduler.validate(CraftScheduler.java:395) ~[bukkit.jar:git-Bukkit-f326992]
    at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:123) ~[bukkit.jar:git-Bukkit-f326992]
    at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftScheduler.scheduleSyncRepeatingTask(CraftScheduler.java:119) ~[bukkit.jar:git-Bukkit-f326992]
    at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftScheduler.scheduleSyncRepeatingTask(CraftScheduler.java:454) ~[bukkit.jar:git-Bukkit-f326992]
    at com.redtsch.RedHub.ServerCore.Utils.tpTimer(Utils.java:48) ~[?:?]
    at com.redtsch.RedHub.ServerCore.Listeners.Commands.CmdSpawn.onCommand(CmdSpawn.java:25) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[bukkit.jar:git-Bukkit-f326992]
    ... 15 more

{{Merged by moderator: Please use the Edit button next time}}

 

Bump?

 

@timtower
Thanks for the response
And how can I change that?
EDIT: would using just "core" instead of "core.getInstance()" work?

 

Bump?

 

Does it teleport you once it reaches 3 seconds?

 

@_Nish_ no, it doesn't. But i'm not working on this anymore, thanks for the help =)