i'm getting this error with 3.16

2013-03-17 09:02:57 [INFO] [VanishNoPacket] Enabling VanishNoPacket v3.16
2013-03-17 09:02:57 [INFO] [VanishNoPacket] Loading support for v1_5_R1
2013-03-17 09:02:57 [INFO] [VanishNoPacket] Using color changing features of TagAPI.
2013-03-17 09:02:57 [INFO] [VanishNoPacket] Now hooking into Essentials
2013-03-17 09:02:57 [SEVERE] Error occurred while enabling VanishNoPacket v3.16 (Is it up to date?)
java.lang.NoClassDefFoundError: com/comphenix/protocol/events/PacketListener
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2413)
at java.lang.Class.getConstructor0(Class.java:2723)
at java.lang.Class.getConstructor(Class.java:1676)
at org.kitteh.vanish.hooks.HookManager.registerHook(HookManager.java:147)
at org.kitteh.vanish.hooks.HookManager.registerHook(HookManager.java:167)
at org.kitteh.vanish.hooks.HookManager.getHook(HookManager.java:90)
at org.kitteh.vanish.VanishPlugin.onEnable(VanishPlugin.java:265)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.v1_5_R1.CraftServer.loadPlugin(CraftServer.java:282)
at org.bukkit.craftbukkit.v1_5_R1.CraftServer.enablePlugins(CraftServer.java:264)
at net.minecraft.server.v1_5_R1.MinecraftServer.j(MinecraftServer.java:303)
at net.minecraft.server.v1_5_R1.MinecraftServer.e(MinecraftServer.java:282)
at net.minecraft.server.v1_5_R1.MinecraftServer.a(MinecraftServer.java:242)
at net.minecraft.server.v1_5_R1.DedicatedServer.init(DedicatedServer.java:150)
at net.minecraft.server.v1_5_R1.MinecraftServer.run(MinecraftServer.java:381)
at net.minecraft.server.v1_5_R1.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: com.comphenix.protocol.events.PacketListener
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:80)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 19 more