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Openflow plugin error - Failed to prepare transaction member-1-datastore-operational-fe-28-chn-29-txn-0-0 on backend

Hi, I am using ODL(carbon 0.6.0) as controller and ofdpa3.0 as ofagent(on real hardware-tomahawk). I the below openflow plugin exceptions/errors. Can you help me to understand why am i seeing these errors and how to resolve them

2017-08-29 11:36:11,932 | ERROR | ult-dispatcher-3 | LocalThreePhaseCommitCohort | 207 - org.opendaylight.controller.sal-distributed-datastore - 1.5.0.Carbon | Failed to prepare transaction member-1-datastore-operational-fe-28-chn-29-txn-0-0 on backend java.lang.IllegalArgumentException: Metadata not available for modification NodeModification [identifier=(urn:opendaylight:flow:inventory?revision=2013-08-19)table[{(urn:opendaylight:flow:inventory?revision=2013-08-19)id=211}], modificationType=TOUCH, childModification={AugmentationIdentifier{childNames=[(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics]}=NodeModification [identifier=AugmentationIdentifier{childNames=[(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics]}, modificationType=TOUCH, childModification={(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics=NodeModification [identifier=(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics, modificationType=WRITE, childModification={}]}]}] . . 2017-08-29 11:36:11,944 | ERROR | entLoopGroup-9-1 | TransactionChainManager | 305 - org.opendaylight.openflowplugin.impl - 0.4.0.Carbon | Exception during INITIAL transaction submitting. java.util.concurrent.ExecutionException: TransactionCommitFailedException{message=canCommit encountered an unexpected failure, errorList=[RpcError [message=canCommit encountered an unexpected failure, severity=ERROR, errorType=APPLICATION, tag=operation-failed, applicationTag=null, info=null, cause=java.lang.IllegalArgumentException: Metadata not available for modification NodeModification [identifier=(urn:opendaylight:flow:inventory?revision=2013-08-19)table[{(urn:opendaylight:flow:inventory?revision=2013-08-19)id=211}], modificationType=TOUCH, childModification={AugmentationIdentifier{childNames=[(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics]}=NodeModification [identifier=AugmentationIdentifier{childNames=[(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics]}, modificationType=TOUCH, childModification={(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics=NodeModification [identifier=(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics, modificationType=WRITE, childModification={}]}]}]]]} . . Caused by: TransactionCommitFailedException{message=canCommit encountered an unexpected failure, errorList=[RpcError [message=canCommit encountered an unexpected failure, severity=ERROR, errorType=APPLICATION, tag=operation-failed, applicationTag=null, info=null, cause=java.lang.IllegalArgumentException: Metadata not available for modification NodeModification [identifier=(urn:opendaylight:flow:inventory?revision=2013-08-19)table[{(urn:opendaylight:flow:inventory?revision=2013-08-19)id=211}], modificationType=TOUCH, childModification={AugmentationIdentifier{childNames=[(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics]}=NodeModification [identifier=AugmentationIdentifier{childNames=[(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics]}, modificationType=TOUCH, childModification={(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics=NodeModification [identifier=(urn:opendaylight:flow:table:statistics?revision=2013-12-15)flow-table-statistics, modificationType=WRITE, childModification={}]}]}]]]} . . 2017-08-29 11:36:11,960 | WARN | entLoopGroup-9-1 | ContextChainHolderImpl | 305 - org.opendaylight.openflowplugin.impl - 0.4.0.Carbon | Not able to set MASTER role on device openflow:55930, reason: Initial transaction cannot be submitted. 2017-08-29 11:36:11,960 | WARN | entLoopGroup-9-1 | ContextChainHolderImpl | 305 - org.opendaylight.openflowplugin.impl - 0.4.0.Carbon | This mastering is mandatory, destroying context chain and closing connection. 2017-08-29 11:36:11,961 | DEBUG | entLoopGroup-9-1 | StatisticsContextImpl | 305 - org.opendaylight.openflowplugin.impl - 0.4.0.Carbon | Stop the running statistics gathering for node openflow:55930