Exception Errors

Code:

 null
org.bukkit.command.CommandException: Unhandled exception executing command 'case' in plugin CaseKits v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:624) ~[craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1058) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:919) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_25]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_25]
    at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:643) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:598) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:506) [craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 27
    at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftInventoryCustom$MinecraftInventory.setItem(CraftInventoryCustom.java:105) ~[craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftInventory.setItem(CraftInventory.java:81) ~[craftbukkit-1.8.jar:git-Bukkit-17962f6]
    at com.plasticono.crate.CrateCommand.onCommand(CrateCommand.java:72) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.8.jar:git-Bukkit-17962f6]
    ... 14 more

This is the error I'm getting. What do I do?

 

What you can do is give us your code in your classes and then we can try to help you

EDIT: Take a look at this. It will help you troubleshoot your own plugins. https://bukkit.org/threads/how-to-r...ubleshoot-your-own-plugins-by-yourself.32457/

 

You are getting the 27th value from an array from an inventory that only has 27 slots. Slots and array indexes are not the same. Make sure that the index you are trying to get is not the same as the amount of slots in the inventory.