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Spark context stopped while waiting for backend
java.lang.IllegalStateException: Spark context stopped while waiting for backend	at org.apache.spark.scheduler.TaskSchedulerImpl.waitBackendReady(TaskSchedulerImpl.scala:581)	at org.apache.spark.scheduler.TaskSchedulerImpl.postStartHook(TaskSchedulerImpl.scala:162)	at org.apache.spark.SparkContext.(SparkContext.scala:549)	at org.apache.spark.api.java.JavaSparkContext.(JavaSparkContext.scala:58)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:240)	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)	at py4j.Gateway.invoke(Gateway.java:236)	at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80)	at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69)	at py4j.GatewayConnection.run(GatewayConnection.java:211)	at java.lang.Thread.run(Thread.java:745)