antibot error1

2012-09-07 03:58:07 [WARNING] Could not properly handle event PLAYER_KICK:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: net.minecraft.serv                                                             er.NetworkReaderThread
        at org.bukkit.event.Listener.onPlayerKick(Listener:0)
        at sun.reflect.GeneratedMethodAccessor343.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:143)
        at org.bukkit.craftbukkit.entity.CraftPlayer.kickPlayer(CraftPlayer.java:215)
        at me.freebuild.superspytx.handlers.ab.chat.CaptchaHandler.handle(CaptchaHandler.java:36)
        at me.freebuild.superspytx.ab.listeners.ChatListener.onPlayerChatLow(ChatListener.java:48)
        at sun.reflect.GeneratedMethodAccessor155.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:831)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:808)
        at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.NetworkManager.i(NetworkManager.java:211)
        at net.minecraft.server.NetworkManager.c(NetworkManager.java:326)
        at net.minecraft.server.NetworkReaderThread.run(SourceFile:93)
2012-09-07 03:58:07 [INFO] This error is logged only once: it could have occurred multiple times by                                                              now.
2012-09-07 03:58:07 [INFO] Please contact one of the authors of plugin 'AntiBot':
2012-09-07 03:58:07 [WARNING] Could not properly handle event PLAYER_QUIT:
java.lang.IllegalAccessError: Synchronized code got accessed from another thread: net.minecraft.serv                                                             er.NetworkReaderThread
        at org.bukkit.event.Listener.onPlayerQuit(Listener:0)
        at sun.reflect.GeneratedMethodAccessor261.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at net.minecraft.server.ServerConfigurationManagerAbstract.disconnect(ServerConfigurationMan                                                             agerAbstract.java:206)
        at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:165)
        at org.bukkit.craftbukkit.entity.CraftPlayer.kickPlayer(CraftPlayer.java:215)
        at me.freebuild.superspytx.handlers.ab.chat.CaptchaHandler.handle(CaptchaHandler.java:36)
        at me.freebuild.superspytx.ab.listeners.ChatListener.onPlayerChatLow(ChatListener.java:48)
        at sun.reflect.GeneratedMethodAccessor155.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:831)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:808)
        at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.NetworkManager.i(NetworkManager.java:211)
        at net.minecraft.server.NetworkManager.c(NetworkManager.java:326)
        at net.minecraft.server.NetworkReaderThread.run(SourceFile:93)
2012-09-07 03:58:07 [INFO] This error is logged only once: it could have occurred multiple times by                                                              now.
2012-09-07 03:58:07 [INFO] Please contact one of the authors of plugin 'AntiBot':