2012-08-04 15:36:01 [WARNING] [VanishNoPacket] "VanishNoPacket v3.11" has registered a listener for org.bukkit.event.player.PlayerChatEvent on method "public void org.kitteh.vanish.listeners.ListenPlayerMessages.onPlayerChat(org.bukkit.event.player.PlayerChatEvent)", but the event is Deprecated. Server performance will be affected; please notify the authors [mbaxter].
org.bukkit.plugin.AuthorNagException
at org.bukkit.plugin.java.JavaPluginLoader.createRegisteredListeners(JavaPluginLoader.java:302)
at org.bukkit.plugin.SimplePluginManager.registerEvents(SimplePluginManager.java:507)
at org.kitteh.vanish.VanishPlugin.onEnable(VanishPlugin.java:312)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:357)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:263)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:245)
at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:564)
at org.bukkit.Bukkit.reload(Bukkit.java:182)
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:22)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:490)
at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:879)
at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:826)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:808)
at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
at net.minecraft.server.ServerConnection.b(SourceFile:35)
at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

Duplicate of #247