plugin is not able to delete ucast mac local entry from operational ds

Following msgs are from karaf.log
Attached the output from operational topology.

2016-03-18 11:39:01,308 | TRACE | ntLoopGroup-11-1 | JsonRpcEndpoint | 213 - org.opendaylight.ovsdb.library - 1.2.2.SNAPSHOT | Request : null "update" ["ba8f3c8a-5ae5-4e36-bd6e-eb3fa44c5431",{"Physical_Locator":{"4cacb63a-4ff4-4376-9b42-e2c87fb50a4d":{"old":

{"bfd":["map",[]],"_uuid":["uuid","4cacb63a-4ff4-4376-9b42-e2c87fb50a4d"],"_version":["uuid","d04b9b39-1438-4625-94e1-0c9ef82aebbf"],"dst_ip":"10.10.10.10","bfd_status":["map",[]],"encapsulation_type":"vxlan_over_ipv4"}

}},"Physical_Locator_Set":{"a315f653-8aee-43ee-bf39-8bdc0a9e68c6":{"old":

{"locators":["uuid","4cacb63a-4ff4-4376-9b42-e2c87fb50a4d"],"_uuid":["uuid","a315f653-8aee-43ee-bf39-8bdc0a9e68c6"],"_version":["uuid","ead71bfd-f52e-4981-8ebe-c2d96aa70b77"]}

}},"Mcast_Macs_Local":{"ce08af18-b755-4030-857f-2fa1e25f1bc5":{"old":{"ipaddr":"","_uuid":["uuid","ce08af18-b755-4030-857f-2fa1e25f1bc5"],"_version":["uuid","c93c4957-e11f-43e2-bb3a-493caa722c25"],"locator_set":["uuid","a315f653-8aee-43ee-bf39-8bdc0a9e68c6"],"logical_switch":["uuid","1ba43e0c-fbb9-465a-8e2a-729ed20960f0"],"MAC":"unknown-dst"}}}}]
2016-03-18 11:39:01,316 | TRACE | ntLoopGroup-11-1 | HwvtepMonitorCallback | 228 - org.opendaylight.ovsdb.hwvtepsouthbound-impl - 1.2.2.SNAPSHOT | result: TableUpdates [map={Physical_Locator_Set=TableUpdate [{a315f653-8aee-43ee-bf39-8bdc0a9e68c6=RowUpdate [uuid=a315f653-8aee-43ee-bf39-8bdc0a9e68c6, oldRow=Row [columns={_version=[_version=ead71bfd-f52e-4981-8ebe-c2d96aa70b77], _uuid=[_uuid=a315f653-8aee-43ee-bf39-8bdc0a9e68c6], locators=[locators=[4cacb63a-4ff4-4376-9b42-e2c87fb50a4d]]}], newRow=null]}], Physical_Locator=TableUpdate [{4cacb63a-4ff4-4376-9b42-e2c87fb50a4d=RowUpdate [uuid=4cacb63a-4ff4-4376-9b42-e2c87fb50a4d, oldRow=Row [columns={_version=[_version=d04b9b39-1438-4625-94e1-0c9ef82aebbf], bfd=[bfd={}], dst_ip=[dst_ip=10.10.10.10], bfd_status=[bfd_status={}], encapsulation_type=[encapsulation_type=vxlan_over_ipv4], _uuid=[_uuid=4cacb63a-4ff4-4376-9b42-e2c87fb50a4d]}], newRow=null]}], Mcast_Macs_Local=TableUpdate [{ce08af18-b755-4030-857f-2fa1e25f1bc5=RowUpdate [uuid=ce08af18-b755-4030-857f-2fa1e25f1bc5, oldRow=Row [columns={_version=[_version=c93c4957-e11f-43e2-bb3a-493caa722c25], logical_switch=[logical_switch=1ba43e0c-fbb9-465a-8e2a-729ed20960f0], ipaddr=[ipaddr=], locator_set=[locator_set=a315f653-8aee-43ee-bf39-8bdc0a9e68c6], MAC=[MAC=unknown-dst], _uuid=[_uuid=ce08af18-b755-4030-857f-2fa1e25f1bc5]}], newRow=null]}]}, error=null, details=null, getError()=null, getDetails()=null, getClass()=class org.opendaylight.ovsdb.lib.message.TableUpdates, hashCode()=924916088, toString()=org.opendaylight.ovsdb.lib.message.TableUpdates@37211978] dbSchema: hardware_vtep

2016-03-18 11:39:01,318 | WARN | n-invoker-impl-0 | TransactionInvokerImpl | 228 - org.opendaylight.ovsdb.hwvtepsouthbound-impl - 1.2.2.SNAPSHOT | Exception invoking Transaction:
java.lang.IllegalArgumentException: All keys must be specified for class org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.hwvtep.rev150901.hwvtep.global.attributes.LocalMcastMacsKey. Missing key is getLogicalSwitchRef. Supplied key is LocalMcastMacsKey [_macEntryKey=MacAddress [_value=00:00:00:00:00:00]]
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145)[39:com.google.guava:18.0.0]
at org.opendaylight.yangtools.binding.data.codec.impl.ValueContext.getAndSerialize(ValueContext.java:46)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.IdentifiableItemCodec.serialize(IdentifiableItemCodec.java:124)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.IdentifiableItemCodec.serialize(IdentifiableItemCodec.java:31)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.KeyedListNodeCodecContext.addYangPathArgument(KeyedListNodeCodecContext.java:52)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.DataObjectCodecContext.bindingPathArgumentChild(DataObjectCodecContext.java:193)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.BindingCodecContext.getCodecContextNode(BindingCodecContext.java:127)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.InstanceIdentifierCodec.serialize(InstanceIdentifierCodec.java:29)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.InstanceIdentifierCodec.serialize(InstanceIdentifierCodec.java:19)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.yangtools.binding.data.codec.impl.BindingNormalizedNodeCodecRegistry.toYangInstanceIdentifier(BindingNormalizedNodeCodecRegistry.java:87)[86:org.opendaylight.mdsal.binding-dom-codec:0.8.1.SNAPSHOT]
at org.opendaylight.controller.md.sal.binding.impl.BindingToNormalizedNodeCodec.toYangInstanceIdentifierBlocking(BindingToNormalizedNodeCodec.java:99)[121:org.opendaylight.controller.sal-binding-broker-impl:1.3.1.SNAPSHOT]
at org.opendaylight.controller.md.sal.binding.impl.AbstractWriteTransaction.doDelete(AbstractWriteTransaction.java:129)[121:org.opendaylight.controller.sal-binding-broker-impl:1.3.1.SNAPSHOT]
at org.opendaylight.controller.md.sal.binding.impl.BindingDOMWriteTransactionAdapter.delete(BindingDOMWriteTransactionAdapter.java:73)[121:org.opendaylight.controller.sal-binding-broker-impl:1.3.1.SNAPSHOT]
at org.opendaylight.ovsdb.hwvtepsouthbound.transactions.md.MacEntriesRemoveCommand.removeMcastMacsLocal(MacEntriesRemoveCommand.java:108)[228:org.opendaylight.ovsdb.hwvtepsouthbound-impl:1.2.2.SNAPSHOT]
at org.opendaylight.ovsdb.hwvtepsouthbound.transactions.md.MacEntriesRemoveCommand.execute(MacEntriesRemoveCommand.java:59)[228:org.opendaylight.ovsdb.hwvtepsouthbound-impl:1.2.2.SNAPSHOT]
at org.opendaylight.ovsdb.hwvtepsouthbound.transactions.md.HwvtepOperationalCommandAggregator.execute(HwvtepOperationalCommandAggregator.java:46)[228:org.opendaylight.ovsdb.hwvtepsouthbound-impl:1.2.2.SNAPSHOT]
at org.opendaylight.ovsdb.hwvtepsouthbound.transactions.md.TransactionInvokerImpl.run(TransactionInvokerImpl.java:88)[228:org.opendaylight.ovsdb.hwvtepsouthbound-impl:1.2.2.SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)[:1.7.0_85]
at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_85]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_85]