Solved Unable to find (command argument)

Problem:
I don't know if this is my code problem but whenever I do /spleef, it works fine:

/spleef
/spleef (Player)
/spleef reload
/spleef reset
/spleef accept
/spleef deny
are all the commands I have coded which have outputs.
However, whenever I do a player's name, no message "Unable to find ______" shows. /spleef accept and /spleef deny also works fine. However, for arguments such as /spleef reload, /spleef reset or a non-existent argument such as /spleef base, I get this message in red "Unable to find _____.". Valid arguments still work the way they are supposed to, just that they show this "Unable to find ______" message before the intended functions trigger.

I don't really know what could be a problem.
I'll attach my code, but just be ready for the long and confusing parts.


My coding environment:
Spigot 1.8.8 JAR uploaded into Build Path
Pom.xml empty (I didn't put any dependencies or repositories, I don't understand what's the point of doing so too)
Plugin.yml filled with all the required info such as main class, name, version, description, no depends/softdepends. Only one command registered: /spleef

CODES: (Don't hurt your brain that much)
MAIN CLASS:

Code (Java):

package com.gmail.calorious;

import org.bukkit.plugin.java.JavaPlugin;

import commands.*;
import events.*;

public class SpleefGame extends JavaPlugin {
    private static SpleefGame instance;
    public static SpleefGame getInstance() { return instance; }
    @Override
    public void onEnable() {
        instance = this;
        saveDefaultConfig();
        getServer().getPluginManager().registerEvents(new SpleefWinnerEvents(), this);
        getServer().getPluginManager().registerEvents(new ChallengingEvents(), this);
        getCommand("spleef").setExecutor(new SpleefBaseCommand());
    }
 
    @Override
    public void onDisable() {}
}
 

SpleefBaseCommand class:

Code (Java):

package commands;

import java.util.ArrayList;
import java.util.UUID;

import org.bukkit.Bukkit;
import org.bukkit.GameMode;
import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.command.ConsoleCommandSender;
import org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer;
import org.bukkit.entity.Player;

import com.gmail.calorious.SpleefGame;

import net.md_5.bungee.api.ChatColor;
import net.md_5.bungee.api.chat.ClickEvent;
import net.md_5.bungee.api.chat.ComponentBuilder;
import net.md_5.bungee.api.chat.HoverEvent;
import net.md_5.bungee.api.chat.TextComponent;
import net.minecraft.server.v1_8_R3.PacketPlayOutTitle;
import net.minecraft.server.v1_8_R3.IChatBaseComponent.ChatSerializer;
import net.minecraft.server.v1_8_R3.PacketPlayOutTitle.EnumTitleAction;

public class SpleefBaseCommand implements CommandExecutor {
           private static String challengername = null;
           Player player = null;
           private static ArrayList<UUID> players = new ArrayList<UUID>();
           public static ArrayList<UUID> getPlayers() {
               return players;
           }
       
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if(cmd.getName().equalsIgnoreCase("spleef")) {
            if(args.length == 0) {
                sender.sendMessage(ChatColor.GOLD + "      Spleef     ");
                sender.sendMessage(ChatColor.DARK_GRAY + "=======================");
                sender.sendMessage(ChatColor.GREEN + " /spleef - Base Command/Shows this info");
                sender.sendMessage(ChatColor.GREEN + " /spleef (Player) - Challenge a player to Spleef.");
                sender.sendMessage(ChatColor.GREEN + " /spleef reload - Reload the configuration with new values.");
                sender.sendMessage(ChatColor.GOLD + "      Spleef     ");
                sender.sendMessage(ChatColor.DARK_GRAY + "=======================");
                return true;
            }
            if(args.length > 0 && !args[0].equalsIgnoreCase("accept") && !args[0].equalsIgnoreCase("deny")) {
                Player target = Bukkit.getPlayer(args[0]);
                if(target == null) {
                    sender.sendMessage(ChatColor.RED + "Unable to find " + args[0] + ChatColor.RED + ".");
                } else {
                    sender.sendMessage(ChatColor.GREEN + "Successfully sent a challenge to " + ChatColor.GOLD + target.getName() + ChatColor.GREEN + ".");
                    target.sendMessage(ChatColor.GOLD + sender.getName() + " has sent you a Spleef challenge.");
                    TextComponent acceptmessage = new TextComponent("[Accept]");
                    TextComponent spacemessage = new TextComponent(" ");
                    TextComponent denymessage = new TextComponent("[Deny]");
                    acceptmessage.setClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/spleef accept"));
                    denymessage.setClickEvent(new ClickEvent(ClickEvent.Action.RUN_COMMAND, "/spleef deny"));
                    acceptmessage.setHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ComponentBuilder("Accept the challenge").bold(true).color(ChatColor.GREEN).create()));
                    denymessage.setHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, new ComponentBuilder("Decline the challenge").bold(true).color(ChatColor.RED).create()));
                    target.spigot().sendMessage(acceptmessage, spacemessage, denymessage);
                    challengername = sender.getName();
                }
            }
            if(args.length > 0 && args[0].equalsIgnoreCase("accept") && !args[0].equalsIgnoreCase("deny")) { //ACCEPT COMMAND, SENT BY (TARGET), THE CHALLENGED
                sender.sendMessage(ChatColor.GREEN + "You have accepted the spleef challenge from " + ChatColor.GOLD + challengername);
                Player challenger = Bukkit.getPlayer(challengername);
                challenger.sendMessage(ChatColor.GOLD + sender.getName() + ChatColor.GREEN + " has accepted your spleef challenge.");
                Player player = (Player) sender;  // player is now challenged
                player.getInventory().clear();
                challenger.getInventory().clear();
                sender.sendMessage(ChatColor.GOLD + "Your inventory has been cleared.");
                challenger.sendMessage(ChatColor.GOLD + "Your inventory has been cleared.");
                Location player1loc = new Location(challenger.getWorld(), SpleefGame.getInstance().getConfig().getDouble("arenas.1.p1spawnx"), SpleefGame.getInstance().getConfig().getDouble("arenas.1.p1spawny"), SpleefGame.getInstance().getConfig().getDouble("arenas.1.p1spawnz"));
                Location player2loc = new Location(challenger.getWorld(), SpleefGame.getInstance().getConfig().getDouble("arenas.1.p2spawnx"), SpleefGame.getInstance().getConfig().getDouble("arenas.1.p2spawny"), SpleefGame.getInstance().getConfig().getDouble("arenas.1.p2spawnz"));
                challenger.teleport(player1loc);
                player.teleport(player2loc);
                PacketPlayOutTitle countdown3 = new PacketPlayOutTitle(EnumTitleAction.TITLE, ChatSerializer.a("[\"\",{\"text\":\"3\",\"bold\":true,\"color\":\"green\"}]"));
              PacketPlayOutTitle countdown2 = new PacketPlayOutTitle(EnumTitleAction.TITLE, ChatSerializer.a("[\"\",{\"text\":\"2\",\"bold\":true,\"color\":\"gold\"}]"));
              PacketPlayOutTitle countdown1 = new PacketPlayOutTitle(EnumTitleAction.TITLE, ChatSerializer.a("[\"\",{\"text\":\"1\",\"bold\":true,\"color\":\"red\"}]"));
              PacketPlayOutTitle countdownstart = new PacketPlayOutTitle(EnumTitleAction.TITLE, ChatSerializer.a("[\"\",{\"text\":\"Start!\",\"bold\":true,\"color\":\"green\"}]"));
              ((CraftPlayer) challenger).getHandle().playerConnection.sendPacket(countdown3);
              ((CraftPlayer) player).getHandle().playerConnection.sendPacket(countdown3);
              Bukkit.getScheduler().scheduleSyncDelayedTask(SpleefGame.getInstance(), () -> {
                  ((CraftPlayer) challenger).getHandle().playerConnection.sendPacket(countdown2);
                 ((CraftPlayer) sender).getHandle().playerConnection.sendPacket(countdown2);
                  }, 40L);
           
              Bukkit.getScheduler().scheduleSyncDelayedTask(SpleefGame.getInstance(), () -> {
                      ((CraftPlayer) challenger).getHandle().playerConnection.sendPacket(countdown1);
              ((CraftPlayer) sender).getHandle().playerConnection.sendPacket(countdown1);
                  }, 40L);
              Bukkit.getScheduler().scheduleSyncDelayedTask(SpleefGame.getInstance(), () -> {
                    ((CraftPlayer) challenger).getHandle().playerConnection.sendPacket(countdownstart);
            ((CraftPlayer) sender).getHandle().playerConnection.sendPacket(countdownstart);
                }, 40L);
         
              players.add(challenger.getUniqueId());
              players.add(player.getUniqueId());
              for(UUID challengers : players) {
                  Bukkit.getPlayer(challengers).setGameMode(GameMode.SURVIVAL);
              }
            for(String command : SpleefGame.getInstance().getConfig().getStringList("commands")) {
                final ConsoleCommandSender console = Bukkit.getServer().getConsoleSender();
                command.replace("{target}", player.getName());
                command.replace("{challenger}", challenger.getName());
                Bukkit.dispatchCommand(console, command);
            }
            Bukkit.broadcastMessage(ChatColor.GREEN + "SpleefGame: Sent by " + ChatColor.GOLD + challengername + ChatColor.GREEN + " to " + ChatColor.GOLD + player.getName() + ChatColor.GREEN + ", issued all commands.");
            }
            if(args.length > 0 && !args[0].equalsIgnoreCase("accept") && args[0].equalsIgnoreCase("deny")) { //DECLINE COMMAND, SENT BY (TARGET), THE CHALLENGED
                sender.sendMessage(ChatColor.RED + "You have declined the Spleef challenge from " + challengername);
                Player challenger = Bukkit.getPlayer(challengername);
                challenger.sendMessage(ChatColor.RED + "Your challenge to " + sender.getName() + " has been declined.");
            }
            if(args.length > 0 && !args[0].equalsIgnoreCase("accept") && !args[0].equalsIgnoreCase("deny") && args[0].equalsIgnoreCase("reload")) {
                SpleefGame.getInstance().reloadConfig();
                sender.sendMessage(ChatColor.GREEN + "Successfully reloaded SpleefGame's configuration.");
            }
        }
        return true;

}
}
 

Event Class 1 - SpleefWinnerEvents:

Code (Java):

package events;

import java.util.UUID;

import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.PlayerDeathEvent;

import com.gmail.calorious.SpleefGame;

import commands.SpleefBaseCommand;
import net.md_5.bungee.api.ChatColor;

public class SpleefWinnerEvents implements Listener {
    Player winner = null;
    @EventHandler(priority = EventPriority.HIGHEST)
    public void onPlayerDeath(PlayerDeathEvent e) {
        if(SpleefBaseCommand.getPlayers().contains(e.getEntity().getUniqueId())) {
            SpleefBaseCommand.getPlayers().remove(e.getEntity().getUniqueId());
            for(UUID winneruuid : SpleefBaseCommand.getPlayers()) {
                winner = Bukkit.getPlayer(winneruuid);
            }
            Bukkit.broadcastMessage(ChatColor.GOLD + winner.getName() + ChatColor.GREEN + " has won the Spleef challenge!");
                Bukkit.broadcastMessage(ChatColor.GOLD + winner.getName() + ChatColor.GREEN + " has won the Spleef challenge!");
            Bukkit.getScheduler().scheduleSyncDelayedTask(SpleefGame.getInstance(), new Runnable() {
                public void run() {
                    SpleefBaseCommand.getPlayers().clear();
                }
            }, 20L);
        }
    }
}
 

Event Class 2 - During a challenge events:

Code (Java):

package events;

import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerCommandPreprocessEvent;

import commands.SpleefBaseCommand;
import net.md_5.bungee.api.ChatColor;

public class ChallengingEvents implements Listener {
    @EventHandler
    public void onCommandPreprocess(PlayerCommandPreprocessEvent e) {
        if(e.getMessage().contains("spleef")) {
            if(SpleefBaseCommand.getPlayers().contains(e.getPlayer().getUniqueId())) {
                e.setCancelled(true);
                e.getPlayer().sendMessage(ChatColor.RED + "You are unable to run this command while you are in a Spleef challenge.");
            }
        }
    }

}
 

 

Ok i'm blind and I need to analyse my code better, thanks!