[22:34:09] [Server thread/INFO]: Crisis_Killer issued server command: /upgrade
[22:34:09] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'upgrade' in plugin PrisonGems v1.1.2
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:624) ~[craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1058) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:919) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit.jar:git-Bukkit-0899683]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_45]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_45]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:643) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:598) [craftbukkit.jar:git-Bukkit-0899683]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:506) [craftbukkit.jar:git-Bukkit-0899683]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_45]
Caused by: java.lang.NullPointerException
	at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftMetaItem.applyEnchantments(CraftMetaItem.java:420) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftMetaItem.applyToItem(CraftMetaItem.java:382) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftMetaEnchantedBook.applyToItem(CraftMetaEnchantedBook.java:55) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftItemStack.setItemMeta(CraftItemStack.java:404) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftItemStack.asNMSCopy(CraftItemStack.java:48) ~[craftbukkit.jar:git-Bukkit-0899683]
	at org.bukkit.craftbukkit.v1_8_R1.inventory.CraftInventory.setItem(CraftInventory.java:81) ~[craftbukkit.jar:git-Bukkit-0899683]
	at me.mrCookieSlime.CSCoreLibPlugin.general.Inventory.ChestMenu.build(ChestMenu.java:121) ~[?:?]
	at me.mrCookieSlime.PrisonGems.UpgradeManager.showPreview(UpgradeManager.java:188) ~[?:?]
	at me.mrCookieSlime.PrisonGems.main.onCommand(main.java:156) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-0899683]
	... 14 more
[22:34:13]