Player Doesn't Recieve The ItemStack

Hey guys, my name is Lucas. I am somewhat new to Bukkit Coding, but have the basics down, so don't worry about explaining anything too in depth to me. Anyways, here's my problem. I can't seem to get my plugin to give me the item I want it to. Basically, I'm trying to give a player who runs the command /vam money voucher (amount) a voucher with a specific display name and item meta that I've specified. For some reason, the command registers, but no error is given, nor do I receive the item. The last error I got from the code told me there was an error in the line of code where I added the specified ItemStack to the player's inventory. What can I do to fix my problem? Thank you guys for any help you can provide.

Here's my code now:

My main class:

Code:

package com.thechocolatedev;

import org.bukkit.plugin.java.JavaPlugin;

public class VAMFront extends JavaPlugin {
  
    public void onEnable() {
      
        getServer().getPluginManager().registerEvents(new MoneyRedeem(), this);
        getCommand("vam").setExecutor(new MoneyVouchCom());
      
    }
  
}

My command class:

Code:

package com.thechocolatedev;

import java.util.Arrays;

import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

public class MoneyVouchCom implements CommandExecutor{

    @SuppressWarnings("deprecation")
    @Override
    public boolean onCommand(CommandSender sender, Command com, String label, String[] args) {
      
        //An if statement checking to see if the sender is a player or not
        if(!(sender instanceof Player)) {
          
            //Warn the command executor they are using the command in the wrong place
            sender.sendMessage("This command cannot be executed by console personnel. Please try again in-game");
          
        }
      
        else {
          
            //An if statement to check to see if the command and args are correct
            //Command: /vam. Arg 1: money. Arg 2: voucher Arg 3: (Amount of money to be on the voucher).
            if(com.getName().equalsIgnoreCase("vam") && args.length == 3 && args[0].equalsIgnoreCase("money") && args[1].equalsIgnoreCase("voucher")) {
              
                //Set a player variable as the sender
                Player player = (Player) sender;
              
                //A debug test
                player.sendMessage("Test Complete");
              
                /* Create the material of the voucher and set an amount for the item stack
                and create a new item stack based off of those variables */
                Material material = Material.PAPER;
                int amount = 0;
                ItemStack moneyVouch = new ItemStack(material, amount);
                moneyVouch.setType(Material.PAPER);
              
                //Get the item meta and change the name and lore
                ItemMeta mvMeta = moneyVouch.getItemMeta();
                mvMeta.setDisplayName(ChatColor.GREEN + "Money" + ChatColor.YELLOW + "Voucher");
                mvMeta.setLore(Arrays.asList(ChatColor.DARK_AQUA + "Right-click to redeem", ChatColor.GREEN + "$" + args[2]));
              
                //Get the player's inventory and put the money voucher in the next available slot
                Inventory playerInv = player.getInventory();
                playerInv.addItem(moneyVouch);
                player.updateInventory();
              
            }
              
        }
      
        return false;
      
    }

}

My plugin.yml:

Code:

name: VAM
version: 1.0
main: com.thechocolatedev.VAMFront
author: CallMeFilmsTCD
commands:
vam:
  description: Lists all VAM commands

 

Return false if this is the case. Currently, this sends the message if the sender is not a player, but then does nothing about it and continues.

Do you receive the "Test worked" message?

 

Yes, I do receive the test message. In fact, I actually got an error before telling me the line containing
playerInv.addItem(moneyVouch); was the problem, but I changed a little since then. However, I am still convinced the changing of the inventory is the problem. I also got an error before about the item itself. I don't know what exactly is the problem, but I'm sure it has to do with either creating the ItemStack or putting it in the inventory.