warpgui error 2

[22:16:46 ERROR]: Could not pass event InventoryClickEvent to WarpGUI v4.5.5
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1820) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:33) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:10) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_112]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_112]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:696) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:371) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:651) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:555) [craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
Caused by: java.lang.IllegalArgumentException: No enum constant org.bukkit.Sound.NOTE_PIANO
        at java.lang.Enum.valueOf(Enum.java:238) ~[?:1.8.0_112]
        at org.bukkit.Sound.valueOf(Sound.java:1) ~[craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        at me.mehboss.warpgui.Menu.onInventoryClick(Menu.java:126) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor272.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_112]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_112]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[craftbukkit-1.12.2.jar:git-Bukkit-9ab298d]
        ... 15 more