Solved I can't figure out what is causing this Exception.

Hello!

I've been developing a Bukkit plugin that allows you to switch resourcepacks in-game using a GUI.

I have a class where I am running a command (not the class I have posted) and a class that gets the GUI for a player (it shows what resource pack they have enabled)

If you need any other classes, just ask!

The class that is causing the error can be found here. (Pastebin)

The error is here:

Error (open) Error (close)

Code:

[10:16:44 ERROR]: null

org.bukkit.command.CommandException: Unhandled exception executing command 'rps' in plugin ResourcePacks v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_75]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_75]
        at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:696) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:634) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537) [spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at java.lang.Thread.run(Unknown Source) [?:1.7.0_75]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 18
        at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftInventoryCustom$MinecraftInventory.setItem(CraftInventoryCustom.java:105) ~[spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftInventory.setItem(CraftInventory.java:81) ~[spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        at me.hrsn0410.rp.Menu.getResourcePackMenu(Menu.java:94) ~[?:?]
        at me.hrsn0410.rp.ResourcePacks.onCommand(ResourcePacks.java:34) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-ed3e3af-ee6d0fa]
        ... 14 more

 

@HRSN0410 Your inventory is only 9 slots, and you're trying to set some of your items in slots that don't exist. Thus, throwing an NPE. For your plugin to work, you'd need to set the amount of slots to 54 (the max slots an inventory can have without being buggy).

 

Ah I see. That was a placeholder and I forgot to replace it