Solved Internal Error Occurred?

when ever i try and use a command in-game, i get this error: "An internal error occurred while attempting to preform this command"

wondering if anyone could help me figure out whats wrong?

thanks,
- BuuR

Code:

package me.buur.main;

import static org.bukkit.ChatColor.*;

import org.bukkit.Material;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.potion.*;
import org.bukkit.command.*;
import org.bukkit.command.Command;
import org.bukkit.enchantments.Enchantment;
import org.bukkit.inventory.*;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.entity.*;

public class rpgpluginmain extends JavaPlugin {

    public void onEnable() {

    }

    public void onDisable() {

    }
   
   


    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
       

        Player p = (Player) sender;
       
        if (label.equalsIgnoreCase("class")) {
            if (args.length == 0) {
                p.sendMessage(RED + "No arguments. Try /class ?");
            }
           
            //CHARACTER CLASSES
           
            //WARRIOR
            if (args[0].equalsIgnoreCase("Choose")) {
                if (args[1].equalsIgnoreCase("warrior")) {
                    Inventory inv = p.getInventory();

                    ItemStack warriorWeap = new ItemStack(Material.IRON_SWORD);
                    warriorWeap.addEnchantment(Enchantment.KNOCKBACK, 0);
                    ItemMeta warriorWeapMeta = warriorWeap.getItemMeta();
                    warriorWeapMeta.setDisplayName("Long Sword");
                    warriorWeap.setItemMeta(warriorWeapMeta);
                    ItemStack warriorHelm = new ItemStack(Material.IRON_HELMET);
                    ItemStack warriorChest = new ItemStack(Material.IRON_CHESTPLATE);
                    ItemStack warriorLegs = new ItemStack(Material.IRON_LEGGINGS);
                    ItemStack warriorFeet = new ItemStack(Material.IRON_BOOTS);
                    inv.addItem(warriorWeap);
                    inv.addItem(warriorHelm);
                    inv.addItem(warriorChest);
                    inv.addItem(warriorLegs);
                    inv.addItem(warriorFeet);
                    p.sendMessage(GREEN + "Fight hard, brave one!");
                }
               
                //ARCHER
               
                if (args[1].equalsIgnoreCase("archer")) {
                    Inventory inv = p.getInventory();

                    ItemStack archerWeap = new ItemStack(Material.BOW);
                    ItemStack archerAmmo = new ItemStack(Material.ARROW, 128);
                    archerWeap.addEnchantment(Enchantment.ARROW_DAMAGE, 0);
                    ItemStack archerHelm = new ItemStack(Material.LEATHER_HELMET);
                    ItemStack archerChest = new ItemStack(Material.LEATHER_CHESTPLATE);
                    ItemStack archerLegs = new ItemStack(Material.LEATHER_LEGGINGS);
                    ItemStack archerFeet = new ItemStack(Material.LEATHER_BOOTS);
                    inv.addItem(archerWeap);
                    inv.addItem(archerAmmo);
                    inv.addItem(archerHelm);
                    inv.addItem(archerChest);
                    inv.addItem(archerLegs);
                    inv.addItem(archerFeet);
                    p.sendMessage(GREEN + "Fight hard, brave one!");
                }
               
                //ROGUE
               
                if (args[0].equalsIgnoreCase("Choose")) {
                    if (args[1].equalsIgnoreCase("rogue")) {
                        Inventory inv = p.getInventory();
                        ItemStack rogueWeap = new ItemStack(Material.GOLD_SWORD);
                        rogueWeap.addEnchantment(Enchantment.DAMAGE_ALL, 0);
                        inv.addItem(rogueWeap);
                        p.sendMessage(GREEN + "Fight hard, brave one!");

                    }
       
                }

            }
            if (args[0].equalsIgnoreCase("?")) {
                p.sendMessage("Use /class choose [class name]");
            }
            if (args[0].equalsIgnoreCase("list")) {
                p.sendMessage("List of classes: Warrior, Rogue, Archer.");
            }
           
           
        }
       
        if (p.getInventory().getItemInHand().getType() == Material.GOLD_SWORD){
            p.addPotionEffect(new PotionEffect(PotionEffectType.INVISIBILITY, 999999, 0));
           
        }else if (p.getInventory().getItemInHand().getType() == Material.IRON_SWORD) {
            p.addPotionEffect(new PotionEffect(PotionEffectType.ABSORPTION, 999999, 0));
           
        }
       
        return true;
    }

   

}

Figured it out! i had the enchant levels set to "0", instead of "1"!

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@BuuR Please mark the thread as solved.

 

I actually have another question about my code. I want the bottom part to be continuously checking the player. how would i go about doing that?

Code:

        }
      
        if (p.getInventory().getItemInHand().getType() == Material.GOLD_SWORD){
            p.addPotionEffect(new PotionEffect(PotionEffectType.INVISIBILITY, 999999, 0));
          
        }else if (p.getInventory().getItemInHand().getType() == Material.IRON_SWORD) {
            p.addPotionEffect(new PotionEffect(PotionEffectType.ABSORPTION, 999999, 0));
          
        }
      
        return true;
    }
  
}