Plugin Help Plugin Interferance?

So on my test server I have an event handler that tests for certain item names and then dispatches a command from the player. It works , Ive tried it on my test server and it works, but when I send it to my friend to put it on his server it does not work.
Here is the Code:

Code:

    @SuppressWarnings("deprecation")
       @EventHandler
       public void PickBoost(PlayerInteractEvent e){
           Player p = e.getPlayer();
           ItemStack item = p.getItemInHand();
           Action action = e.getAction();
           if (!(e.getAction() == Action.RIGHT_CLICK_AIR || action.equals(Action.RIGHT_CLICK_BLOCK))) return;
           if (!(e.getItem().getType() == Material.DIAMOND_PICKAXE)) return;
              p.playSound(p.getLocation(), Sound.LEVEL_UP, 1, 1);
              p.addPotionEffect(new PotionEffect(PotionEffectType.FAST_DIGGING, 20000000, 3));
              p.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, 20000000, 1));
              p.getPlayer().setAllowFlight(true);
              p.getPlayer().setFlying(true);
          if(e.getPlayer().getItemInHand().getType() == (Material.DIAMOND_PICKAXE))
          {
          if(e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK)
             {
              Player p1 = e.getPlayer();
              ItemStack i = p1.getItemInHand();
              ItemMeta im = i.getItemMeta();
              if (im.getDisplayName().equalsIgnoreCase("§c§lA-Pickaxe"))
              {
                  Bukkit.dispatchCommand(p1, "sellall a");
              }
                if (im.getDisplayName().equalsIgnoreCase("§c§lB-Pickaxe"))
                {
                    Bukkit.dispatchCommand(p1, "sellall b");
                }
                if (im.getDisplayName().equalsIgnoreCase("§c§lC-Pickaxe"))
                {
                    Bukkit.dispatchCommand(p1, "sellall c");
                }
etc.... and so on with more ranks

This works fine for me
Here is my friends Plugin List:
LightningEdit [My Plugin]
ProtocolLib-3.4.0
Vault-1.4.1
AdvancedMOTD
AlphaChest
AlwaysDay
AntiBotUltra
AutoAnnouncer
BKCommonLib
Buycraft
ChatControl
ChestCommands
Citizens
ClearLag
CommandBlocker
CrateReloaded
CustomDeathMessages
DragonMOTD
EZPrestige
EZRanksLite
EnderRankup
Essentials
EzBlocks
FirstJoinPlus
GAListener
HolographicDisplays
ImmortalCustom
ItemRenamer
LoginCommand
MultiWorld
Multiverse-Core
Multiverse-Portals
Onjoincommand
PermissionsEx
PlayerVaults
PlotMe
PluginMetrics
PrisonMine
PrisonSuite
QuickSell
ServerSigns
TokenEnchant
Updater
VoteParty
Votifier
VoxelSniper
WarpPortals
WhatisIt
WorldEdit
WorldGuard
contrib
floAuction
McMMO

These are all his plugins....
I don't know if these are interfering with anything. I do know that my Plugin depends on Vault and ProtocolLib. He does have the correct versions.

Plugin Yml:

Code:

 
name: LightningEdit
main: com.enjin.lightningedit.LightningEdit
depend: [ProtocolLib, Vault]
version: 1.0
description: LightningEdit - A Custom Made Plugin by TheDiamond06
author: TheDiamond06
website: lightningmchd.enjin.com
commands:

 

Any locally-grown plugins may be compiled with new releases of Java that your friend may not have. It's always best to avoid Java 8 and try to stick to Java 6 whenever possible, and your friend might have an outdated version of Java.

 

Ok. Thanks, didn't know that the version of java had to do with anything. I'll tell him to update it.

 

Yup. Higher releases of Java can work with things compiled in lower releases, but not vice versa. They keep adding new features in each version of Java, so the client has to have an environment that can handle all of the features in the program's version.