Command still works but chat says internal error

The command still works but the chat says there an internal error.

Error: http://pastebin.com/hcFXepDw

Area of code that is causing the problem:

Code:java

public HashMap<Player, ItemStack[]> invsave = new HashMap<Player, ItemStack[]>();
 
    public HashMap<Player, ItemStack[]> armorsave = new HashMap<Player, ItemStack[]>();
 
    @SuppressWarnings("deprecation")
    public boolean onCommand(CommandSender sender, Command cmd,
            String commandLabel, String[] args) {
 
        Player player = (Player) sender;
 
        if (commandLabel.equalsIgnoreCase("duty")) {
            if (args.length == 0) {
 
                if (player.hasPermission("duty.enable")) {
                    Player p = (Player) sender;
 
                    invsave.put(p, p.getInventory().getContents());
                    armorsave.put(p, p.getInventory().getArmorContents());
 
                    Inventory pinv = (Inventory) player.getInventory();
                    Bukkit.broadcastMessage(((Player) sender).getDisplayName()
                            + ChatColor.GOLD + " is now on duty!!");
                    pinv.clear();
                    player.sendMessage(ChatColor.AQUA
                            + "Your inventory has been cleared");
                    // All int's for enchantment and item id's
                    int fire = 20;
                    int firelevel = 2;
                    int sword = 276;
                    int boots = 305;
                    int helmet = 302;
                    int chest = 303;
                    int legs = 304;
                    int effect = 0;
                    int effect1 = 34;
                    int effect2 = 16;
                    int level2 = 5;
                    int level = 4;
                    int level1 = 3;
 
                    ItemStack sword1 = new ItemStack(sword);
                    ItemStack boots1 = new ItemStack(boots);
                    ItemStack chest1 = new ItemStack(chest);
                    ItemStack helmet1 = new ItemStack(helmet);
                    ItemStack legs1 = new ItemStack(legs);
                    Enchantment myEnchantment = new EnchantmentWrapper(effect);
                    Enchantment myEnchantment1 = new EnchantmentWrapper(effect1);
                    Enchantment myEnchantment2 = new EnchantmentWrapper(effect2);
                    Enchantment myEnchantment3 = new EnchantmentWrapper(fire);
                    boots1.addEnchantment(myEnchantment, level);
                    chest1.addEnchantment(myEnchantment, level);
                    helmet1.addEnchantment(myEnchantment, level);
                    legs1.addEnchantment(myEnchantment, level);
                    boots1.addEnchantment(myEnchantment1, level1);
                    chest1.addEnchantment(myEnchantment1, level1);
                    helmet1.addEnchantment(myEnchantment1, level1);
                    legs1.addEnchantment(myEnchantment1, level1);
                    sword1.addEnchantment(myEnchantment2, level2);
                    sword1.addEnchantment(myEnchantment1, level1);
                    sword1.addEnchantment(myEnchantment3, firelevel);
                    player.getInventory().setChestplate(chest1);
                    player.getInventory().setHelmet(helmet1);
                    player.getInventory().setBoots(boots1);
                    player.getInventory().setLeggings(legs1);
                    player.getInventory().addItem(sword1);
                    player.sendMessage(ChatColor.GRAY
                            + "Armor and Items have be given to you.");
                } else {
                    sender.sendMessage(ChatColor.DARK_RED
                            + "YOU DO NOT HAVE PREMISSION TO DO THIS COMMAND!!");
                }
            }

Sorry for so much code. Apparently the error is with the hasmaps but it still works so, I dont know what the problem is.

 

PHP:

Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
        at me.Austin.Duty.Duty.onCommand(Duty.java:121) ~[?:?]

Also, don't explicitly cast Player to CommandSender unless you've used an instanceof check.

 

So how would I do that
Wizehh

 

Well, first show us line 121; or, to be safe, just post the entire class (imports and all).
And to check the sender you'd do something like this:

PHP:

//(assuming your CommandSender paramater is named 'sender')
 
if (!(sender instanceof Player)) {
    //the sender is not a player
} else {
    //the sender is a player
}

 

Thank you problem solved.