[SEVERE] Could not pass event PlayerJoinEvent to FAuthSec v1.2
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:363)
	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:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
	at gm.c(ServerConfigurationManager.java:263)
	at gm.a(ServerConfigurationManager.java:174)
	at it.completeConnection(NetLoginHandler.java:214)
	at cpw.mods.fml.common.network.FMLNetworkHandler.handleClientConnection(FMLNetworkHandler.java:157)
	at cpw.mods.fml.common.network.FMLNetworkHandler.onConnectionReceivedFromClient(FMLNetworkHandler.java:111)
	at it.d(NetLoginHandler.java:190)
	at it.c(NetLoginHandler.java:81)
	at hu.a(ServerListenThread.java:58)
	at ht.b(DedicatedServerListenThread.java:33)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:870)
	at ho.r(DedicatedServer.java:309)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:746)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:633)
	at fy.run(ThreadMinecraftServer.java:16)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R3/Packet
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at me.FurH.FAuthSec.core.internals.InternalManager.createObject(InternalManager.java:59)
	at me.FurH.FAuthSec.core.internals.InternalManager.getEntityPlayer(InternalManager.java:40)
	at me.FurH.FAuthSec.core.CoreListener.onPlayerJoin(CoreListener.java:34)
	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:361)
	... 18 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_R3.Packet
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:255)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:247)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 28 more