Проблема в коде Netty при входе в игру

Question

Я попытался войти в свою игру, но в коде есть проблема:

[INFO]: [Netty]: Client connected from /127.0.0.1:50626 (-1915907797)

    java.lang.NullPointerException
            at gtanks.auth.Auth.onPasswordAccept(Auth.java:157)
            at gtanks.auth.Auth.executeCommand(Auth.java:79)
            at gtanks.main.netty.ProtocolTransfer.sendCommandToManagers(ProtocolTran
    sfer.java:111)
            at gtanks.main.netty.ProtocolTransfer.sendRequestToManagers(ProtocolTran
    sfer.java:102)
            at gtanks.main.netty.ProtocolTransfer.decryptProtocol(ProtocolTransfer.j
    ava:73)
            at gtanks.main.netty.NettyUsersHandlerController.onMessageRecived(NettyU
    sersHandlerController.java:33)
            at gtanks.main.netty.NettyUsersHandler.messageReceived(NettyUsersHandler
    .java:50)
            at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(S
    impleChannelUpstreamHandler.java:70)
            at gtanks.main.netty.NettyUsersHandler.handleUpstream(NettyUsersHandler.
    java:27)
            at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultCh
    annelPipeline.java:564)
            at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerC
    ontext.sendUpstream(DefaultChannelPipeline.java:791)
            at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:29
    6)
            at org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream(O
    neToOneDecoder.java:70)
            at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultCh
    annelPipeline.java:564)
            at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultCh
    annelPipeline.java:559)
            at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:26
    8)
            at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:25
    5)
            at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
            at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(Abstract
    NioWorker.java:108)
            at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNi
    oSelector.java:337)
            at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioW
    orker.java:89)
            at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
            at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnabl
    e.java:108)
            at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProof
    Worker.java:42)
            at org.jboss.netty.handler.execution.MemoryAwareThreadPoolExecutor$Memor
    yAwareRunnable.run(MemoryAwareThreadPoolExecutor.java:606)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
            at java.lang.Thread.run(Unknown Source)

Снимок экрана: http://prntscr.com/o8cubs

Можете ли вы помочь мне исправить эту ошибку?