HILFE!!!

Command :
package game.commands;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import game.inventory.SpendenInv;


public class SpendenCommand implements CommandExecutor {

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        Player p = (Player) sender;

            SpendenInv.openSpendenInv(p);

        return false;
    }

}


Inventar :

package game.inventory;

import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;


public class SpendenInv {


    public static void openSpendenInv(Player player){
        Inventory spenden = Bukkit.createInventory(null, 9, "§3Spenden");

        //ItemStack
        ItemStack Ränge = new ItemStack(Material.PAPER);
        ItemStack Rechte = new ItemStack(Material.PAPER);
        ItemStack Level = new ItemStack(Material.PAPER);
        ItemStack Crates = new ItemStack(Material.PAPER);
        ItemStack Kits = new ItemStack(Material.PAPER);
        ItemStack Stuff = new ItemStack(Material.PAPER);
        ItemStack Adden = new ItemStack(Material.NETHER_STAR);

        //ItemMeta
        ItemMeta Rängem = Ränge.getItemMeta();
        ItemMeta Rechtem = Ränge.getItemMeta();
        ItemMeta Levelm = Ränge.getItemMeta();
        ItemMeta Cratesm = Ränge.getItemMeta();
        ItemMeta Kitsm = Ränge.getItemMeta();
        ItemMeta Stuffm = Ränge.getItemMeta();
        ItemMeta Addenm = Ränge.getItemMeta();

        //Lore
        ArrayList<String> Rängel = new ArrayList<>();
        Rängel.add("§7Vip = §310Euro");
        Rängel.add("§7Premium = §320Euro");
        Rängel.add("§7Premium+ = §330Euro");
        Rängem.setLore(Rängel);

        ArrayList<String> Rechtel = new ArrayList<>();
        Rechtel.add("§7Fly (Dauerhaft) = §320Euro");
        Rechtel.add("§7Umfrage (Dauerhaft) = §35Euro");
        Rängem.setLore(Rechtel);

        ArrayList<String> Levell = new ArrayList<>();
        Levell.add("§7500 = §35Euro");
        Levelm.setLore(Levell);

        ArrayList<String> Cratesl = new ArrayList<>();
        Cratesl.add("§7SkyVote 10x = §35Euro");
        Cratesl.add("§7SkyVote 20x = §310Euro");
        Cratesl.add("§7SkyPrem 10x = §35Euro");
        Cratesl.add("§7SkyPrem 20x = §310Euro");
        Cratesl.add("§7Premium+ 10x = §35Euro");
        Cratesl.add("§7Premium+ 20x = §310Euro");
        Cratesl.add("§7SkySpieler 10x = §35Euro");
        Cratesl.add("§7SkySpieler 20x = §310Euro");
        Cratesl.add("§7Rang 10x = §35Euro");
        Cratesl.add("§7Rang 20x = §310Euro");
        Cratesm.setLore(Cratesl);

        ArrayList<String> Kitsl = new ArrayList<>();
        Kitsl.add("§7Vip 10x = §35Euro");
        Kitsl.add("§7Premium 10x = §310Euro");
        Kitsl.add("§7Premium+ 20x = §320Euro");
        Kitsm.setLore(Kitsl);

        ArrayList<String> Stuffl = new ArrayList<>();
        Stuffl.add("§7Ghasttränen 10x64 = §35Euro");
        Stuffl.add("§7Nethersterne 10x64 = §35Euro");
        Stuffm.setLore(Stuffl);

        ArrayList<String> Addenl = new ArrayList<>();
        Addenl.add("§7Adde philli4000 in Skype");
        Addenl.add("§7um die Sachen zu Kaufen.");
        Addenm.setLore(Addenl);

        //DisplayName
        Rängem.setDisplayName("§3Ränge");
        Rechtem.setDisplayName("§3Rechte");
        Levelm.setDisplayName("§3Level");
        Cratesm.setDisplayName("§3Crates");
        Kitsm.setDisplayName("§3Kits");
        Stuffm.setDisplayName("§3Stuff");
        Addenm.setDisplayName("§3Skype");

        //SetItemMeta
        Ränge.setItemMeta(Rechtem);
        Rechte.setItemMeta(Rechtem);
        Level.setItemMeta(Levelm);
        Crates.setItemMeta(Cratesm);
        Kits.setItemMeta(Kitsm);
        Stuff.setItemMeta(Stuffm);
        Adden.setItemMeta(Addenm);

        spenden.setItem(0, Ränge);
        spenden.setItem(1, Rechte);
        spenden.setItem(2, Level);
        spenden.setItem(3, Crates);
        spenden.setItem(4, Kits);
        spenden.setItem(5, Stuff);
        spenden.setItem(9, Adden);


        player.openInventory(spenden);
    }

}