18:22:50 [SEVERE] Could not pass event PlayerJoinEvent to Orebfuscator v1.8.8
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:35)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
        at net.minecraft.server.v1_4_R1.PlayerList.c(PlayerList.java:159)
        at net.minecraft.server.v1_4_R1.PlayerList.a(PlayerList.java:98)
        at net.minecraft.server.v1_4_R1.PendingConnection.d(PendingConnection.java:135)
        at net.minecraft.server.v1_4_R1.PendingConnection.c(PendingConnection.java:50)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:71)
        at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:589)
        at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
        at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:485)
        at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:420)
        at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.ClassCastException: org.spigotmc.netty.NettyNetworkManager cannot be cast to net.minecraft.server.v1_4_R1.NetworkManager
        at com.lishid.orebfuscator.internal.v1_4_R1.PlayerHook.HookNM(PlayerHook.java:41)
        at com.lishid.orebfuscator.hook.OrebfuscatorPlayerHook.onPlayerJoin(OrebfuscatorPlayerHook.java:45)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 14 more