SparkException: Could not find CoarseGrainedScheduler occurs during the application stop

2018-10-03 14:51:33 ERROR Inbox:91 - Ignoring error
org.apache.spark.SparkException: Could not find CoarseGrainedScheduler.
        at org.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:160)
        at org.apache.spark.rpc.netty.Dispatcher.postOneWayMessage(Dispatcher.scala:140)
        at org.apache.spark.rpc.netty.NettyRpcEnv.send(NettyRpcEnv.scala:187)
        at org.apache.spark.rpc.netty.NettyRpcEndpointRef.send(NettyRpcEnv.scala:528)
        at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend.reviveOffers(CoarseGrainedSchedulerBackend.scala:449)
        at org.apache.spark.scheduler.TaskSchedulerImpl.executorLost(TaskSchedulerImpl.scala:638)
        at org.apache.spark.HeartbeatReceiver$$anonfun$org$apache$spark$HeartbeatReceiver$$expireDeadHosts$3.apply(HeartbeatReceiver.scala:201)
        at org.apache.spark.HeartbeatReceiver$$anonfun$org$apache$spark$HeartbeatReceiver$$expireDeadHosts$3.apply(HeartbeatReceiver.scala:197)
        at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:733)
        at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:130)
        at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:130)
        at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:236)
        at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:40)
        at scala.collection.mutable.HashMap.foreach(HashMap.scala:130)
        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
        at org.apache.spark.HeartbeatReceiver.org$apache$spark$HeartbeatReceiver$$expireDeadHosts(HeartbeatReceiver.scala:197)
        at org.apache.spark.HeartbeatReceiver$$anonfun$receiveAndReply$1.applyOrElse(HeartbeatReceiver.scala:120)
        at org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:105)
        at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
        at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:101)
        at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:221)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)