I am getting this error with the latest version of icJukebox on my 1.9 server. Error: Code: [16:41:15] [Server thread/ERROR]: **** THIS IS NOT AN ISSUE TO DO WITH PER WORLD PLUGINS **** Could not pass event InventoryClickEvent to icJukeBox v1.6.3 org.bukkit.event.EventException at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:122) ~[?:?] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at us.Myles.PWP.TransparentListeners.PWPRegisteredListener.callEvent(PWPRegisteredListener.java:30) [PerServerPlugins.jar:?] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_77] at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_77] at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at java.lang.Thread.run(Unknown Source) [?:1.8.0_77] Caused by: java.lang.NoSuchFieldError: UI_BUTTON_CLICK at com.statiocraft.jukebox.events.evtInventoryClick.runEvent(evtInventoryClick.java:64) ~[?:?] at com.statiocraft.jukebox.events.EventManager.onInventoryClick(EventManager.java:27) ~[?:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_77] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_77] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_77] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_77] at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:120) ~[?:?] ... 16 more [16:41:17] [Server thread/ERROR]: **** THIS IS NOT AN ISSUE TO DO WITH PER WORLD PLUGINS **** Could not pass event InventoryClickEvent to icJukeBox v1.6.3 org.bukkit.event.EventException at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:122) ~[?:?] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at us.Myles.PWP.TransparentListeners.PWPRegisteredListener.callEvent(PWPRegisteredListener.java:30) [PerServerPlugins.jar:?] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1630) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_77] at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_77] at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot_1.8.8_latest.jar:git-Spigot-e4d4710-e1ebe52] at java.lang.Thread.run(Unknown Source) [?:1.8.0_77] Caused by: java.lang.NoSuchFieldError: UI_BUTTON_CLICK at com.statiocraft.jukebox.events.evtInventoryClick.runEvent(evtInventoryClick.java:64) ~[?:?] at com.statiocraft.jukebox.events.EventManager.onInventoryClick(EventManager.java:27) ~[?:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_77] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_77] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_77] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_77] at us.Myles.PWP.TransparentListeners.PerWorldPluginLoader$1.execute(PerWorldPluginLoader.java:120) ~[?:?] ... 16 more [16:41:20] [Thread-25/WARN]: Exception in thread "Thread-25" [16:41:20] [Thread-25/WARN]: java.lang.NoSuchFieldError: BLOCK_NOTE_HARP [16:41:20] [Thread-25/WARN]: at com.statiocraft.xxmicloxx.NoteBlockAPI.Instrument.getInstrument(Instrument.java:10) [16:41:20] [Thread-25/WARN]: at com.statiocraft.xxmicloxx.NoteBlockAPI.RadioSongPlayer.playTick(RadioSongPlayer.java:21) [16:41:20] [Thread-25/WARN]: at com.statiocraft.xxmicloxx.NoteBlockAPI.SongPlayer$1.run(SongPlayer.java:108) [16:41:20] [Thread-25/WARN]: at java.lang.Thread.run(Unknown Source)
According to your log, it seems to me that you are tying to run a 1.9 plugin on a 1.8.8 server. If that is the case, that is what is causing the issue, since the protocols are different in 1.9 than they are in 1.8.