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Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost): java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.spark.streaming.receiver.Receiver
org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost): java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.spark.streaming.receiver.Receiver	at org.apache.spark.streaming.scheduler.ReceiverTracker$ReceiverLauncher$$anonfun$8.apply(ReceiverTracker.scala:305)	at org.apache.spark.streaming.scheduler.ReceiverTracker$ReceiverLauncher$$anonfun$8.apply(ReceiverTracker.scala:300)	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1767)	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1767)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:63)	at org.apache.spark.scheduler.Task.run(Task.scala:70)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)