16:12:48 [SEVERE] Error whilst firing receive hook for packet
java.lang.RuntimeException: Error occured while instancing generated class.
        at com.comphenix.protocol.reflect.compiler.StructureCompiler.compile(StructureCompiler.java:228)
        at com.comphenix.protocol.reflect.compiler.CompiledStructureModifier.withTarget(CompiledStructureModifier.java:126)
        at com.comphenix.protocol.events.PacketContainer.<init>(PacketContainer.java:138)
        at com.comphenix.protocol.injector.spigot.SpigotPacketInjector.packetReceived(SpigotPacketInjector.java:429)
        at com.comphenix.protocol.injector.spigot.SpigotPacketInjector$1.intercept(SpigotPacketInjector.java:207)
        at org.spigotmc.netty.PacketListener$$EnhancerByCGLIB$$139002b6.packetReceived(<generated>)
        at org.spigotmc.netty.PacketListener.callReceived(PacketListener.java:58)
        at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:234)
        at net.minecraft.server.v1_6_R3.PendingConnection.d(PendingConnection.java:58)
        at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:138)
        at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:604)
        at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
        at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:493)
        at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:425)
        at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedConstructorAccessor102.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at com.comphenix.protocol.reflect.compiler.StructureCompiler.compile(StructureCompiler.java:210)
        ... 14 more
Caused by: java.lang.ClassCastException