I have been trying to create races for my server.The first race I am doing (also my first plugin)
is a predator, and this is the error I am getting in my console:SEVERE Could not load 'plugins/Predator.jar' in folder 'plugins'

This is my plugin code:
package me.hunter.Predator;

import java.util.logging.Logger;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.Listener;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;

public class Predator extends JavaPlugin{
private static final Logger log = Logger.getLogger("Minecraft");
public static Predator plugin;
private Listener playerListener;

@Override
public void onEnable(){
log.info("Predator has been enabled");
PluginManager pm = Bukkit.getPluginManager();
pm.registerEvents(this.playerListener, this);
}

@Override
public void onDisable(){
log.info("Predator has beend disabled");

}
@Override
public boolean onCommand(CommandSender sender, Command cmd, String commandLabel,String[] args){
Player player = (Player) sender;
if((cmd.getName().equalsIgnoreCase("predc"))) {
if (!(sender instanceof Player)) {
player.sendMessage(ChatColor.GREEN + "You are now a Predator");
return true;
}
player.addPotionEffect(new PotionEffect(PotionEffectType.JUMP, Integer.MAX_VALUE, 2));
player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, Integer.MAX_VALUE, 2));
player.addPotionEffect(new PotionEffect(PotionEffectType.INCREASE_DAMAGE, Integer.MAX_VALUE, 3));
}
returntrue;
}
}


This is my plugin.yml:
name: Predator
main: me.hunter.Predator.Predator
version: 1.0
commands:
predc:
usage: /<command>
description: Turns you into a predator!