Plugin Error

package com.eric.multiplugin;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class mp extends JavaPlugin{
    public void onEnable() {
    	System.out.println("MyPlugin gestartet");
    }
    public void onDisable() {
        	System.out.println("MyPlugin gestoppt");
    }
    public boolean onCommand(CommandSender sender, Command cmd, String cmdLabel, String[] args){

    	Player p = (Player)sender;

    	//Kommando
    if (cmd.getName().equalsIgnoreCase("Test")){
           if(p != null){
        	   p.sendMessage(ChatColor.RED + "Hallo, " + p.getDisplayName());
        	   p.sendMessage(ChatColor.GREEN + "[Plugin]" + ChatColor.WHITE + "Geladen.");
           } else {
        	   sender.sendMessage(ChatColor.GREEN + "[Plugin]" + ChatColor.WHITE + "Geladen.");
    		return true;
    	}
    }
	return false;
    }
 }