Development Assistance Vault problems :/

Here is the code

Code:

package de.kkkeeeddd.HubCore;

import java.util.ArrayList;
import java.util.List;
import net.milkbowl.vault.economy.Economy;
import net.milkbowl.vault.economy.EconomyResponse;
import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.Sound;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

public class GetGads implements Listener {
   public static Economy econ = null;
   public static Inventory myInventory = Bukkit.createInventory(null, 9, "GetGads");
   static {
     ItemStack eb = new ItemStack(Material.SLIME_BALL, 1);
     ItemMeta eb2 = eb.getItemMeta();
     eb2.setDisplayName("§5Party-Bomb");
     List<String> lore = new ArrayList<String>();
     lore.add("§c§lCosts: §a§l2000 Coins");
     eb2.setLore(lore);
     eb.setItemMeta(eb2);
     myInventory.setItem(0, eb);
     ItemStack cs = new ItemStack(Material.DEAD_BUSH, 1);
     ItemMeta cs2 = cs.getItemMeta();
     cs2.setDisplayName("§cMore GetGads Comming Soon!");
     cs.setItemMeta(cs2);
     ItemStack fw = new ItemStack(Material.FIREWORK, 1);
     ItemMeta fw2 = fw.getItemMeta();
     fw2.setDisplayName("§cFirework");
     fw.setItemMeta(fw2);
     myInventory.setItem(1, fw);
     myInventory.setItem(2, cs);
     myInventory.setItem(3, cs);
     myInventory.setItem(4, cs);
     myInventory.setItem(5, cs);
     myInventory.setItem(6, cs);
     myInventory.setItem(7, cs);
     myInventory.setItem(8, cs);
   }


   @EventHandler
   public void onInventoryClick(InventoryClickEvent event) {
     Player player = (Player) event.getWhoClicked(); // The player that clicked the item
     ItemStack clicked = event.getCurrentItem(); // The item that was clicked
     Inventory inventory = event.getInventory(); // The inventory that was clicked in
     if (inventory.getName().equals(myInventory.getName())) { // The inventory is our custom Inventory
       if (clicked.getType() == Material.SLIME_BALL) { // The item that the player clicked it dirt
         event.setCancelled(true); // Make it so the dirt is back in its original spot
         player.closeInventory(); // Closes there inventory
         Bukkit.dispatchCommand(player, "partybomb");
       }
       if (clicked.getType() == Material.FIREWORK) { // The item that the player clicked it dirt
         event.setCancelled(true); // Make it so the dirt is back in its original spot
         player.closeInventory(); // Closes there inventory
         player.openInventory(fwInventory);
       }
       if (inventory.getName().equals(myInventory.getName())) { // The inventory is our custom Inventory
         if (clicked.getType() == Material.DEAD_BUSH) { // The item that the player clicked it dirt
           event.setCancelled(true); // Make it so the dirt is back in its original spot
         }
       }
     }
   }

   @EventHandler
   public void onMenu(PlayerInteractEvent e) {
     Player p = e.getPlayer();
     Player player = e.getPlayer();
     if (e.getAction() == Action.LEFT_CLICK_AIR || e.getAction() == Action.LEFT_CLICK_BLOCK || e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK) {
       if (p.getInventory().getItemInHand().getType() == Material.PISTON_BASE) {
         e.setCancelled(true);
         player.openInventory(myInventory);
         p.sendMessage("§9GetGads §8§l> §cThis feature is still in the beta phrase! When you find Bugs report them in the Forums.");
       }

     }
   }

   @EventHandler
   public void onJoin(PlayerJoinEvent e) {
     Player p = e.getPlayer();
     ItemStack item1 = new ItemStack(Material.PISTON_BASE);
     ItemMeta meta1 = item1.getItemMeta();
     meta1.setDisplayName("§9§l【§aGetGads§9§l】");
     item1.setItemMeta(meta1);
     p.getInventory().setItem(8, item1);
   }

   public static Inventory fwInventory = Bukkit.createInventory(null, 27, "Firework-Menu");
   static {
     // 1 Mal
     ItemStack fw = new ItemStack(Material.FIREWORK, 1);
     ItemMeta fw2 = fw.getItemMeta();
     fw2.setDisplayName("§51 Firework");
     List<String> lore = new ArrayList<String>();
     lore.add("§c§lCosts: §a§l10 Coins");
     fw2.setLore(lore);
     fw.setItemMeta(fw2);
     fwInventory.setItem(1, fw);
     // 15 Mal
     ItemStack fw1 = new ItemStack(Material.FIREWORK, 15);
     ItemMeta fw21 = fw1.getItemMeta();
     fw21.setDisplayName("§515 Fireworks");
     List<String> lore1 = new ArrayList<String>();
     lore1.add("§c§lCosts: §a§l30 Coins");
     fw21.setLore(lore1);
     fw1.setItemMeta(fw21);
     fwInventory.setItem(4, fw1);
     // 64 Mal
     ItemStack fw11 = new ItemStack(Material.FIREWORK, 64);
     ItemMeta fw211 = fw11.getItemMeta();
     fw211.setDisplayName("§564 Fireworks");
     List<String> lore11 = new ArrayList<String>();
     lore11.add("§c§lCosts: §a§l50 Coins");
     fw211.setLore(lore11);
     fw11.setItemMeta(fw211);
     fwInventory.setItem(7, fw11);
     // Back
     ItemStack fw111 = new ItemStack(Material.ARROW);
     ItemMeta fw2111 = fw111.getItemMeta();
     fw2111.setDisplayName("§cBack");
     fw111.setItemMeta(fw2111);
     fwInventory.setItem(22, fw111);
   }

   @EventHandler
   public void onfwInventoryClick(InventoryClickEvent event) {
     Player player = (Player) event.getWhoClicked(); // The player that clicked the item
     ItemStack clicked = event.getCurrentItem(); // The item that was clicked
     Inventory inventory = event.getInventory(); // The inventory that was clicked in
     if (inventory.getName().equals(fwInventory.getName())) { // The inventory is our custom Inventory
       if (clicked.getItemMeta().getDisplayName().equals("§51 Firework") && clicked.getType() == Material.FIREWORK) { // The item that the player clicked it dirt
         event.setCancelled(true); // Make it so the dirt is back in its original spot
         EconomyResponse r = econ.withdrawPlayer(player.getName(), 10);
      if(r.transactionSuccess()) {
         ItemStack fw1 = (new ItemStack(Material.FIREWORK));
         player.getInventory().addItem(fw1);
  player.sendMessage("§9GetGads §8§l> §aYou bought 1 Firework");
  player.playSound(player.getLocation(), Sound.LEVEL_UP, 10, 2);
      }else{
         player.sendMessage("§9GetGads §8§l> §cNot enough Money!");
      }
       }
     }
     if (clicked.getItemMeta().getDisplayName().equals("§515 Fireworks") && clicked.getType() == Material.FIREWORK) { // The item that the player clicked it dirt
       event.setCancelled(true); // Make it so the dirt is back in its original spot
       ItemStack fw15 = (new ItemStack(Material.FIREWORK, 15));
       player.getInventory().addItem(fw15);
  player.sendMessage("§9GetGads §8§l> §aYou bought 15 Fireworks");
  player.playSound(player.getLocation(), Sound.LEVEL_UP, 10, 2);
     }
     if (clicked.getItemMeta().getDisplayName().equals("§564 Fireworks") && clicked.getType() == Material.FIREWORK) { // The item that the player clicked it dirt
       event.setCancelled(true); // Make it so the dirt is back in its original spot
       ItemStack fw64 = (new ItemStack(Material.FIREWORK, 64));
       player.getInventory().addItem(fw64);
  player.sendMessage("§9GetGads §8§l> §aYou bought 64 Fireworks");
  player.playSound(player.getLocation(), Sound.LEVEL_UP, 10, 2);
     }
     if (clicked.getType() == Material.ARROW) { // The item that the player clicked it dirt
       event.setCancelled(true); // Make it so the dirt is back in its original spot
       player.closeInventory(); // Closes there inventory
       player.openInventory(myInventory);
     }
   }
}

and here the error log

Code:

[23:28:01 ERROR]: Could not pass event InventoryClickEvent to Hub-Core v1.0
org.bukkit.event.EventException
  at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:1477) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.a(PacketPlayInWindowClick.java:15) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.handle(PacketPlayInWindowClick.java:65) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
Caused by: java.lang.NullPointerException
  at de.kkkeeeddd.HubCore.GetGads.onfwInventoryClick(GetGads.java:146) ~[?:?]
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_71]
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_71]
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_71]
  at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_71]
  at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
  ... 13 more

PLZ HELP ME