OSGi error in Topology manager component - After exiting mininet of13 simulation

In continuance to the CONTROLLER-455 I am getting the following error after exiting from the mininet of13 simulation.

osgi> 2014-05-06 17:30:37.958 PDT [pool-15-thread-1] INFO o.o.c.m.s.d.b.i.DOMDataBrokerImpl$CommitCoordination - Tx: DOM-1526 Did not pass canCommit phase.
2014-05-06 17:30:37.959 PDT [pool-15-thread-1] ERROR o.o.c.m.s.b.i.ForwardedBackwardsCompatibleDataBroker - Tx: DOM-1526 Rollback - Datastore commit failed.
2014-05-06 17:30:37.959 PDT [pool-15-thread-1] ERROR o.o.c.m.i.manager.NodeChangeCommiter - Action nodeConnector update [KeyedInstanceIdentifier

{targetType=interface org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.node.NodeConnector, path=[org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.Nodes, org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node[key=NodeKey [_id=Uri [_value=openflow:2]]], org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.node.NodeConnector[key=NodeConnectorKey [_id=Uri [_value=openflow:2:3]]]]}

] failed for Tx:DOM-1526
2014-05-06 17:30:37.966 PDT [pool-15-thread-1] INFO o.o.c.m.s.d.b.i.DOMDataBrokerImpl$CommitCoordination - Tx: DOM-1528 Did not pass canCommit phase.
2014-05-06 17:30:37.968 PDT [pool-15-thread-1] ERROR o.o.c.m.s.b.i.ForwardedBackwardsCompatibleDataBroker - Tx: DOM-1528 Rollback - Datastore commit failed.
2014-05-06 17:30:37.969 PDT [pool-15-thread-1] ERROR o.o.m.c.t.m.FlowCapableTopologyExporter - Topology export failed for Tx:DOM-1528
2014-05-06 17:30:38.025 PDT [pool-15-thread-1] INFO o.o.c.m.s.d.b.i.DOMDataBrokerImpl$CommitCoordination - Tx: DOM-1531 Did not pass canCommit phase.
2014-05-06 17:30:38.027 PDT [pool-15-thread-1] ERROR o.o.c.m.s.b.i.ForwardedBackwardsCompatibleDataBroker - Tx: DOM-1531 Rollback - Datastore commit failed.
2014-05-06 17:30:38.028 PDT [pool-15-thread-1] ERROR o.o.m.c.t.m.FlowCapableTopologyExporter - Topology export failed for Tx:DOM-1531

Regards,
Madhusudhan