07:51:32 [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 net.minecraft.server.MinecraftServer.i(MinecraftServer.java:296)
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:275)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:225)
at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:380)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

Duplicate of #247