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com.datastax.driver.core.exceptions.InvalidQueryException: Key may not be empty
com.datastax.driver.core.exceptions.InvalidQueryException: Key may not be empty	at com.datastax.driver.core.Responses$Error.asException(Responses.java:136)	at com.datastax.driver.core.DefaultResultSetFuture.onSet(DefaultResultSetFuture.java:179)	at com.datastax.driver.core.RequestHandler.setFinalResult(RequestHandler.java:184)	at com.datastax.driver.core.RequestHandler.access$2500(RequestHandler.java:43)	at com.datastax.driver.core.RequestHandler$SpeculativeExecution.setFinalResult(RequestHandler.java:798)	at com.datastax.driver.core.RequestHandler$SpeculativeExecution.onSet(RequestHandler.java:617)	at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:1005)	at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:928)	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)	at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:831)	at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:346)	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)	at java.lang.Thread.run(Thread.java:745)