Exception Journeymap

[01:04:38] [Server thread/WARN]: Failed to handle packet for /79.208.224.165:40015
java.util.NoSuchElementException: packet_handler
        at io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:1080) ~[DefaultChannelPipeline.class:?]
        at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:251) ~[DefaultChannelPipeline.class:?]
        at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:240) ~[DefaultChannelPipeline.class:?]
        at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.insertIntoChannel(NetworkDispatcher.java:177) ~[NetworkDispatcher.class:?]
        at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.serverToClientHandshake(NetworkDispatcher.java:164) ~[NetworkDispatcher.class:?]
        at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.fmlServerHandshake(FMLNetworkHandler.java:72) ~[FMLNetworkHandler.class:?]
        at net.minecraft.server.network.NetHandlerLoginServer.func_147326_c(NetHandlerLoginServer.java:135) ~[pa.class:?]
        at net.minecraft.server.network.NetHandlerLoginServer.func_73660_a(NetHandlerLoginServer.java:63) ~[pa.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:285) ~[gw.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:179) [ox.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:784) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:391) [nx.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:665) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:523) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]
[01:04:38] [Server thread/INFO]: The_BrainStone lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.io.IOException: Can't serialize unregistered packet