[21:03:27 INFO]: Dirkjan56 issued server command: /bukkitpiano invsee Dirkjan56
[21:03:27 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'bukkitpiano' in plugin BukkitPiano v0.8
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit.jar:git-Bukkit-0cd0397]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit.jar:git-Bukkit-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchCommand(CraftServer.java:625) ~[craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.PlayerConnection.handleCommand(PlayerConnection.java:1297) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.PlayerConnection.a(PlayerConnection.java:1157) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(SourceFile:37) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(SourceFile:9) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit.jar:git-Bukkit-0cd0397]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
        at net.minecraft.server.v1_9_R2.SystemUtils.a(SourceFile:45) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:683) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:360) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:639) [craftbukkit.jar:git-Bukkit-0cd0397]
        at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:543) [craftbukkit.jar:git-Bukkit-0cd0397]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.IllegalArgumentException: Chests must have a size that is a multiple of 9!
        at org.apache.commons.lang.Validate.isTrue(Validate.java:136) ~[craftbukkit.jar:git-Bukkit-0cd0397]
        at org.bukkit.craftbukkit.v1_9_R2.CraftServer.createInventory(CraftServer.java:1481) ~[craftbukkit.jar:git-Bukkit-0cd0397]
        at me.glatteis.bukkitpiano.server.ServerMain.StringToInventory(ServerMain.java:195) ~[?:?]
        at me.glatteis.bukkitpiano.server.ServerMain.onCommand(ServerMain.java:130) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit.jar:git-Bukkit-0cd0397]
        ... 15 more