exception in delete Logical Switch

when run deleting ULN script test, the following exception is observed. To reproduce, run:
./runTests.sh -c # create layer 3 logical network demo
./runTests.sh -d # create layer 3 logical network demo

2016-01-04 11:37:21,908 | DEBUG | pool-41-thread-1 | VcNetNodeServiceProvider | 266 - org.opendaylight.faas.fabric-mgr-impl - 1.0.0.SNAPSHOT | FABMGR: rmLneLayer2: rmLogicSwitch RPC success
2016-01-04 11:37:21,908 | DEBUG | pool-41-thread-1 | FabricMgrProvider | 266 - org.opendaylight.faas.fabric-mgr-impl - 1.0.0.SNAPSHOT | FABMGR: removeLneLayer2: rmLneLayer2 RPC success
2016-01-04 11:37:21,903 | ERROR | lt-dispatcher-14 | LocalThreePhaseCommitCohort | 165 - org.opendaylight.controller.sal-distributed-datastore - 1.3.0.SNAPSHOT | Failed to prepare transaction member-1-txn-184 on backend
TransactionCommitFailedException{message=Data did not pass validation., errorList=[RpcError [message=Data did not pass validation., severity=ERROR, errorType=APPLICATION, tag=operation-failed, applicationTag=null, info=null, cause=org.opendaylight.yangtools.yang.data.api.schema.tree.ModifiedNodeDoesNotExistException: Node /(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=fabric:1}

] does not exist. Cannot apply modification to its children.]]}
at org.opendaylight.controller.cluster.datastore.SimpleShardDataTreeCohort.canCommit(SimpleShardDataTreeCohort.java:62)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator$CohortEntry.canCommit(ShardCommitCoordinator.java:602)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.doCanCommit(ShardCommitCoordinator.java:322)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.handleCanCommit(ShardCommitCoordinator.java:283)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.handleReadyLocalTransaction(ShardCommitCoordinator.java:255)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.Shard.handleReadyLocalTransaction(Shard.java:479)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.Shard.onReceiveCommand(Shard.java:235)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
at akka.persistence.UntypedPersistentActor.onReceive(Eventsourced.scala:430)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at org.opendaylight.controller.cluster.common.actor.MeteringBehavior.apply(MeteringBehavior.java:97)[161:org.opendaylight.controller.sal-clustering-commons:1.3.0.SNAPSHOT]
at akka.actor.ActorCell$$anonfun$become$1.applyOrElse(ActorCell.scala:534)[150:com.typesafe.akka.actor:2.3.14]
at akka.persistence.Recovery$State$class.process(Recovery.scala:30)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.ProcessorImpl$$anon$2.process(Processor.scala:103)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.ProcessorImpl$$anon$2.aroundReceive(Processor.scala:114)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.Recovery$class.aroundReceive(Recovery.scala:265)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.UntypedPersistentActor.akka$persistence$Eventsourced$$super$aroundReceive(Eventsourced.scala:428)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.Eventsourced$$anon$2.doAroundReceive(Eventsourced.scala:82)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.Eventsourced$$anon$2.aroundReceive(Eventsourced.scala:78)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.Eventsourced$class.aroundReceive(Eventsourced.scala:369)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.persistence.UntypedPersistentActor.aroundReceive(Eventsourced.scala:428)[155:com.typesafe.akka.persistence.experimental:2.3.14]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)[150:com.typesafe.akka.actor:2.3.14]
at akka.actor.ActorCell.invoke(ActorCell.scala:487)[150:com.typesafe.akka.actor:2.3.14]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)[150:com.typesafe.akka.actor:2.3.14]
at akka.dispatch.Mailbox.run(Mailbox.scala:220)[150:com.typesafe.akka.actor:2.3.14]
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397)[150:com.typesafe.akka.actor:2.3.14]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:262)[147:org.scala-lang.scala-library:2.10.1.v20130302-092018-VFINAL-33e32179fd]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975)[147:org.scala-lang.scala-library:2.10.1.v20130302-092018-VFINAL-33e32179fd]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1478)[147:org.scala-lang.scala-library:2.10.1.v20130302-092018-VFINAL-33e32179fd]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)[147:org.scala-lang.scala-library:2.10.1.v20130302-092018-VFINAL-33e32179fd]
Caused by: org.opendaylight.yangtools.yang.data.api.schema.tree.ModifiedNodeDoesNotExistException: Node /(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=fabric:1}

] does not exist. Cannot apply modification to its children.
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:181)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkChildPreconditions(AbstractNodeContainerModificationStrategy.java:204)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:188)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.MinMaxElementsValidation.checkTouchApplicable(MinMaxElementsValidation.java:145)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkChildPreconditions(AbstractNodeContainerModificationStrategy.java:204)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:188)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.StructuralContainerModificationStrategy.checkApplicable(StructuralContainerModificationStrategy.java:97)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkChildPreconditions(AbstractNodeContainerModificationStrategy.java:204)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractNodeContainerModificationStrategy.checkTouchApplicable(AbstractNodeContainerModificationStrategy.java:188)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:125)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.RootModificationApplyOperation.checkApplicable(RootModificationApplyOperation.java:72)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractDataTreeTip.validate(AbstractDataTreeTip.java:38)[81:org.opendaylight.yangtools.yang-data-impl:0.8.0.SNAPSHOT]
at org.opendaylight.controller.cluster.datastore.SimpleShardDataTreeCohort.canCommit(SimpleShardDataTreeCohort.java:48)[165:org.opendaylight.controller.sal-distributed-datastore:1.3.0.SNAPSHOT]
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