spark運行時異常:org.apache.spark.SparkException: Could not find CoarseGrainedScheduler.

org.apache.spark.SparkException: Could not find CoarseGrainedScheduler. at org.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:154) at org.apache.spark.rpc.netty.Dispatcher.postOneWay
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