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java.lang.AssertionError: null at org.apache.cassandra.transport.ServerConnection.applyStateTransition(ServerConnection.java:100)[apache-cassandra-2.1.14.jar:2.1.14] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:442)[apache-cassandra-2.1.14.jar:2.1.14] at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335)[apache-cassandra-2.1.14.jar:2.1.14] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)[netty-all-4.0.23.Final.jar:4.0.23.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)[netty-all-4.0.23.Final.jar:4.0.23.Final] at io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32)[netty-all-4.0.23.Final.jar:4.0.23.Final] at io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324)[netty-all-4.0.23.Final.jar:4.0.23.Final] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)[na:1.7.0_65] at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164)[apache-cassandra-2.1.14.jar:2.1.14] at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)[apache-cassandra-2.1.14.jar:2.1.14] at java.lang.Thread.run(Thread.java:745)[na:1.7.0_65]