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java.lang.NullPointerException: 	at org.apache.spark.SparkContext.(SparkContext.scala:583)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)	at java.lang.reflect.Constructor.newInstance(Unknown Source)	at org.apache.spark.api.r.RBackendHandler.handleMethodCall(RBackendHandler.scala:162)	at org.apache.spark.api.r.RBackendHandler.channelRead0(RBackendHandler.scala:86)	at org.apache.spark.api.r.RBackendHandler.channelRead0(RBackendHandler.scala:38)	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)