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org.apache.spark.SparkException: Could not find CoarseGrainedScheduler or it has been stopped.	at org.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:162)	at org.apache.spark.rpc.netty.Dispatcher.postLocalMessage(Dispatcher.scala:127)	at org.apache.spark.rpc.netty.NettyRpcEnv.ask(NettyRpcEnv.scala:225)	at org.apache.spark.rpc.netty.NettyRpcEndpointRef.ask(NettyRpcEnv.scala:508)	at org.apache.spark.rpc.RpcEndpointRef.askWithRetry(RpcEndpointRef.scala:101)	at org.apache.spark.rpc.RpcEndpointRef.askWithRetry(RpcEndpointRef.scala:78)	at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend.removeExecutor(CoarseGrainedSchedulerBackend.scala:414)	at org.apache.spark.scheduler.cluster.mesos.CoarseMesosSchedulerBackend.executorTerminated(CoarseMesosSchedulerBackend.scala:553)	at org.apache.spark.scheduler.cluster.mesos.CoarseMesosSchedulerBackend.statusUpdate(CoarseMesosSchedulerBackend.scala:494)