When we perform the get operation from Restconf, SDNR is giving parsing error as below and also given Master down, Which is misleading user. where end device is giving response

2020-04-21T18:05:48,752 | ERROR | nioEventLoopGroupCloseable-3-2 | AbstractFuture | 44 - com.google.guava - 25.1.0.jre | - | RuntimeException while executing runnable CallbackListener

{org.opendaylight.netconf.sal.connect.netconf.sal.NetconfDeviceRpc$1@6a575f51}

with executor MoreExecutors.directExecutor()
java.lang.IllegalArgumentException: Invalid value 'DISABLED' for enum type. Allowed values are: [UP, Initializing, Error, Disabled]
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:440) ~[44:com.google.guava:25.1.0.jre]

2020-04-21T18:05:53,167 | WARN | qtp239435745-952643 | BrokerFacade | 399 - org.opendaylight.netconf.restconf-nb-bierman02 - 1.9.1 | - | Error reading /(urn:onf:otcc:wireless:yang:radio-access:commscope-onecell?revision=2020-04-06)device/fap from datastore CONFIGURATION
java.util.concurrent.ExecutionException: ReadFailedException{message=Read of store CONFIGURATION path /(urn:onf:otcc:wireless:yang:radio-access:commscope-onecell?revision=2020-04-06)device/fap failed, errorList=[RpcError [message=Read of store CONFIGURATION path /(urn:onf:otcc:wireless:yang:radio-access:commscope-onecell?revision=2020-04-06)device/fap failed, severity=ERROR, errorType=APPLICATION, tag=operation-failed, applicationTag=null, info=null, cause=NetconfDocumentedException{message=RemoteDevice

{0005B94238A0}:Master is down. Please try again., errorType=APPLICATION, errorTag=OPERATION_FAILED, errorSeverity=WARNING, errorInfo={}}]]}

Caused by: org.opendaylight.mdsal.common.api.ReadFailedException: Read of store CONFIGURATION path /(urn:onf:otcc:wireless:yang:radio-access:commscope-onecell?revision=2020-04-06)device/fap failed
at org.opendaylight.netconf.topology.singleton.impl.tx.ActorProxyTransactionFacade$2.onComplete(ActorProxyTransactionFacade.java:111) ~[?:?]
at akka.dispatch.OnComplete.internal(Future.scala:279) ~[?:?]
at akka.dispatch.OnComplete.internal(Future.scala:277) ~[?:?]
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:207) ~[?:?]
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:204) ~[?:?]
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64) ~[?:?]
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55) ~[?:?]
at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:92) ~[?:?]
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) ~[?:?]
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:85) ~[?:?]
at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:92) ~[?:?]
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40) ~[?:?]
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:49) ~[?:?]
at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) ~[?:?]
at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) ~[?:?]
at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) ~[?:?]
at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) ~[?:?]
Caused by: org.opendaylight.netconf.api.DocumentedException: RemoteDevice{0005B94238A0}

:Master is down. Please try again.
at org.opendaylight.netconf.topology.singleton.impl.utils.NetconfTopologyUtils.createMasterIsDownException(NetconfTopologyUtils.java:254) ~[?:?]
at org.opendaylight.netconf.topology.singleton.impl.tx.ActorProxyTransactionFacade.processFailure(ActorProxyTransactionFacade.java:218) ~[?:?]
at org.opendaylight.netconf.topology.singleton.impl.tx.ActorProxyTransactionFacade.access$200(ActorProxyTransactionFacade.java:46) ~[?:?]
at org.opendaylight.netconf.topology.singleton.impl.tx.ActorProxyTransactionFacade$2.onComplete(ActorProxyTransactionFacade.java:107) ~[?:?]
at akka.dispatch.OnComplete.internal(Future.scala:279) ~[?:?]