hallo:i have some problem when using the flink-1.8.1 .i wish your help 
Exception discript:2019-12-15 14:06:08,554 ERROR 
org.apache.flink.runtime.rest.handler.job.JobDetailsHandler   - Exception 
occurred in REST handler: Job bf5b710cad760430305bf2b637100028 not found 
2019-12-15 14:06:11,446 ERROR 
org.apache.flink.runtime.rest.handler.taskmanager.TaskManagerDetailsHandler  - 
Unhandled exception. 
org.apache.flink.runtime.resourcemanager.exceptions.UnknownTaskExecutorException:
 No TaskExecutor registered under ba15d1906ef324367fd52321cb99356a.       at 
org.apache.flink.runtime.resourcemanager.ResourceManager.requestTaskManagerInfo(ResourceManager.java:583)
    at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)  at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)     at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:274)
    at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:189)
       at 
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
    at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.onReceive(AkkaRpcActor.java:147) 
     at 
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.onReceive(FencedAkkaRpcActor.java:40)
   at 
akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)  
     at akka.actor.Actor$class.aroundReceive(Actor.scala:502)        at 
akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)         at 
akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)     at 
akka.actor.ActorCell.invoke(ActorCell.scala:495)     at 
akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)      at 
akka.dispatch.Mailbox.run(Mailbox.scala:224)         at 
akka.dispatch.Mailbox.exec(Mailbox.scala:234)        at 
scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)         at 
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     at 
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)     at 
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
 2019-12-15 14:06:11,555 ERROR 
org.apache.flink.runtime.rest.handler.job.JobDetailsHandler   - Exception 
occurred in REST handler: Job bf5b710cad760430305bf2b637100028 not found 
2019-12-15 14:06:14,445 ERROR 
org.apache.flink.runtime.rest.handler.taskmanager.TaskManagerDetailsHandler  - 
Unhandled exception. 
org.apache.flink.runtime.resourcemanager.exceptions.UnknownTaskExecutorException:
 No TaskExecutor registered under ba15d1906ef324367fd52321cb99356a.    at 
org.apache.flink.runtime.resourcemanager.ResourceManager.requestTaskManagerInfo(ResourceManager.java:583)
    at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)  at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)     at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:274)
    at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:189)
       at 
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)
    at 
org.apache.flink.runtime.rpc.akka.AkkaRpcActor.onReceive(AkkaRpcActor.java:147) 
     at 
org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.onReceive(FencedAkkaRpcActor.java:40)
   at 
akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)  
     at akka.actor.Actor$class.aroundReceive(Actor.scala:502)        at 
akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)         at 
akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)     at 
akka.actor.ActorCell.invoke(ActorCell.scala:495)     at 
akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)      at 
akka.dispatch.Mailbox.run(Mailbox.scala:224)         at 
akka.dispatch.Mailbox.exec(Mailbox.scala:234)        at 
scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)         at 
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     at 
scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)     at 
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
my task manager dont have any job,but always have the excepetionhow could i 
stop the exception?here are the picture

it will better reply with chinese!!!Thank you very much!!

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