Plugin Help Gui Help

I have recently been using ServerSelectorX. I have been making a gui with a special command. However, when the command is used nothing happens. This is what is in the console. How can it be fixed?

Code:

10.12 11:11:45 [Server] INFO ... 3 more

10.12 11:11:45 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)

10.12 11:11:45 [Server] INFO at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)

10.12 11:11:45 [Server] INFO at xyz.derkades.serverselectorx.SelectorMenu$1.run(SelectorMenu.java:181)

10.12 11:11:45 [Server] INFO Caused by: java.lang.NullPointerException

10.12 11:11:45 [Server] INFO at java.lang.Thread.run(Unknown Source)

10.12 11:11:45 [Server] INFO at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

10.12 11:11:45 [Server] INFO at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 10.12

11:11:45 [Server] INFO at
org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)

10.12 11:11:45 [Server] WARN org.apache.commons.lang.UnhandledException: Plugin ServerSelectorX v3.2.4 generated an exception while executing task 338

10.12 11:11:45 [Server] WARN Exception in thread "Craft Scheduler Thread - 22"

This is my config as well…

Code:

# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #
#                                                                                                        #
#    For a list of item names see https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html      #
#                                                                                                        #
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #



# Number of rows of slots of your server selector menu. For example '2' will mean 2*9 = 18 slots. Max value is 6.
rows: 2

# This will be displayed as the title of the menu.
title: 'Server Selector'

# This will be the name of the server selector item
item-name: 'Server Selector'

# Item lore. For no lore, put 'none' in the first line.
item-lore:
- 'Right or Left Click to Open'

# The name of the server selector item. Specify "NONE" for no item.
item: COMPASS
data: 0

# Give the item when a player joins?
on-join: false

# What slot should the item be in? Specify -1 to automatically put it in the first available slot.
inv-slot: 0

# URL clickable message
url-message: '&3&lClick here'

# Command to open the menu. Specify "none" for no command. (without /)
command: "james"

# Possible values for action:
#
# Teleport player to server
# action: 'srv:skywars'
#
# Send player a clickable message to open a URL. Only works on spigot, not bukkit.
# action: 'url:http://example.com/'
#
# Teleport player to world
# action: 'world:skyblock'
#
# Execute a command. The player will need permission for this command. No / before the command.
# action: 'cmd:gamemode 1'
# For bungeecord commands, add a bungee: prefix. This requires https://www.spigotmc.org/resources/commandsync.115/ to be installed.
# action: 'bungeecmd:glist'
#
# Open another selector (for submenus for example)
# action: 'sel:uhc-servers'
# SUPER VALUABLE TIP:
# If you set the ip to 'submenu' and ping-server to true, {online} and {max} will be the combined number of players of all servers in the submenu.
#
# Send message
# action: 'msg:&1This &2is &3a &4message'
#
# Close selector
# action: 'close'
#
# Do nothing (selector stays open)
# action: 'none'

menu:

  3: # Item in 4th slot (use 0 for first item). Add as many items as you want by copying this section and giving it a new number. This number must not be greater than (rows*9)-1

    # Whether the server should be pinged for information. Enables placeholders in lore.
    ping-server: true
    ip: sashaizlands.mcph.co # Note that you can't use localhost because the plugin uses an external API by default. For more info see config.yml
    port: 1234
  
    action: 'srv:kitpvp'

    # Change item count based on number of players online. Only works if ping-server is turned on. If there are more than 64 players online, the item count will be 1
    # Change how this works in config.yml.
    change-item-count: true
  
    # This value is ignored when change-item-count is turned on.
    item-count: 1
        
  10: # Item in 6th slot 
    action: 'cmd:GunGame join Gg-1'
    online:
      item: SLIMEBALL # You can use head:auto to get the head of the player opening the menu, or head:SomethingElse to get the head of a specific player.
      data: 0
      enchanted: false
      name: 'BodyBuilder'
      lore:
       - 'City'
       - '&e%server_online_Splatoon% / 6'
      
  11: 
    action: 'none'
    online:
      item: SLIMEBALL
      data: 0
      enchanted: false
      name: 'BodyBuilder'
      lore:
       - 'Coming Soon'
      
  -1: # -1 means everything else
    action: 'none'
    online:
      item: STAINED_GLASS_PANE
      data: 0
      enchanted: false
      name: ''
      lore:

 

The error is saying you're defining a variable then redefining it with an invalid value. 11 and 10 you have 2 items with the same name.