Plugin Problems

package com.enjin.toastsplugins;

import org.bukkit.Bukkit;
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 healb extends JavaPlugin {

        /*
        1. Figure out the player to be healed.
        2. Heal the player.

        (1) If a player is specified, find them.
                If they are not online, send an error message.
        If the player is not online:
                If the sender is a player, heal the sender.
                If the sender is the console, send an error message.
         */

        @SuppressWarnings("deprecation")
		@Override
        public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
                Player target;

                if (args.length == 0 && !(sender instanceof Player)) {
                        sender.sendMessage(ChatColor.RED + "You must specify a player.");
                        return true;
                }

                if (args.length == 0) {
                        target = (Player) sender; // This is safe because we already made sure the sender is a Player.
                }

                else {
                        target = Bukkit.getServer().getPlayer(args[0]);

                        if (target == null) {
                                sender.sendMessage(ChatColor.RED + "Cannot find player " + args[0] + ".");
                                return true;
                        }
                }

                target.setHealth(target.getMaxHealth());

                sender.sendMessage(ChatColor.GREEN + "You have healed " + target.getName() + "!");
                target.sendMessage(ChatColor.GREEN + "You have been healed by " + sender.getName() + "!");

                return true;
        }
}