[SEVERE] null org.bukkit.command.CommandException: Unhandled exception executing command 'backpack' in plugin BukkitInventoryTools v3.1.9 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42) at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168) at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:385) at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:777) at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:737) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:725) at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:178) at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:33) at net.minecraft.server.NetworkManager.b(NetworkManager.java:226) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:100) at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:587) at net.minecraft.server.NetworkListenThread.a(SourceFile:108) at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:536) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:434) at net.minecraft.server.ThreadServerApplication.run(SourceFile:465) Caused by: java.lang.IllegalArgumentException: Invalid inventory size; expected 9 at org.bukkit.craftbukkit.inventory.CraftInventory.setContents(CraftInventory.java:46) at dk.gabriel333.BITBackpack.BITBackpack.onCommand(BITBackpack.java:75) at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40) ... 14 more