问“我的世界”插件出错

EN

Could not load 'plugins\Test.jar' in folder 'plugins'
    org.bukkit.plugin.InvalidPluginException: java.lang.ClassNotFoundException: me.Bench3.youtube.Youtube
    at org.bukkit.plugin.java.javaPluginloader.LoadPlugin(JavaPluginLoader.java:184)

package me.Bench3.youtube;

import java.util.logging.Logger;

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

public class Youtube extends JavaPlugin{
    public final Logger logger = Logger.getLogger("Minecraft");
    public static Youtube plugin;

@Override
public void onDisable(){
    PluginDescriptionFile pdfFile = this.getDescription();
    this.logger.info(pdfFile.getName() + " Has been disabled!");
}

@Override
public void onEnable(){
    PluginDescriptionFile pdfFile = this.getDescription();
    this.logger.info(pdfFile.getName() + " Version " + pdfFile.getVersion() + " Has been enabled!"); //You
}

public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args)
{
    Player player = (Player) sender;
    if (commandLabel.equalsIgnoreCase("sendme"))
    {
        player.sendMessage(ChatColor.BLUE + "Sent");
    }
    return false;
}
}

main: me.Bench3.yotube.Youtube
name: Youtube
version: 1.0