error log floating ip

2017-07-19 10:57:03,502 | INFO  | eChangeHandler-0 | ExternalNetworkGroupInstaller    | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | Installing ext-net group 225002 entry for subnet 41e32a49-f4c7-4536-8e35-7f55b37fa4ba with macAddress 52:54:00:05:56:5a (extInterfaces: [27268224710617:eth12:trunk, 255817722865420:eth12:trunk])
2017-07-19 10:57:03,502 | INFO  | eChangeHandler-0 | LockListener                     | 344 - org.opendaylight.genius.lockmanager-impl - 0.2.0.Carbon | Received remove for lock snatGroupIdPoolsnatmiss.41e32a49-f4c7-4536-8e35-7f55b37fa4ba : Lock{getLockName=snatGroupIdPoolsnatmiss.41e32a49-f4c7-4536-8e35-7f55b37fa4ba, getLockOwner=AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-0, augmentations={}}
2017-07-19 10:57:03,507 | WARN  | nPool-1-worker-1 | InterfaceConfigListener          | 351 - org.opendaylight.genius.interfacemanager-impl - 0.2.0.Carbon | parent refs not specified for 51e7aaf9-ac8e-4757-8580-4bd78c83590e
2017-07-19 10:57:03,822 | WARN  | eChangeHandler-0 | IfMgr                            | 372 - org.opendaylight.netvirt.ipv6service-impl - 0.4.0.Carbon | Update Host interface failed. Could not get Host interface details Uuid [_value=51e7aaf9-ac8e-4757-8580-4bd78c83590e]
2017-07-19 10:57:21,571 | WARN  | ssionScavenger-3 | teInvalidatingHashSessionManager | 229 - org.ops4j.pax.web.pax-web-jetty - 3.2.9 | Timing out for 1 session(s) with id 15ocik7gss82317hqqkjkr44p9
2017-07-19 10:57:31,724 | ERROR | eChangeHandler-3 | FloatingIPListener               | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | NAT Service : Unable to retrieve floatingIpPortMacAddress from floating IP UUID Uuid [_value=433d619b-3adc-41c9-b2d9-f84e93cf649c] for floating IP 10.10.10.9
2017-07-19 10:57:31,724 | ERROR | eChangeHandler-3 | FloatingIPListener               | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | NAT Service : Flow entity received as NULL. Cannot proceed with installation of Pre-DNAT flow table 25 --> table 27 on DpnId 255817722865420
2017-07-19 10:57:31,724 | INFO  | eChangeHandler-3 | FloatingIPListener               | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | NAT Service : Building PSNAT Flow entity for ip 10.10.5.9
2017-07-19 10:57:31,727 | INFO  | eChangeHandler-3 | FloatingIPListener               | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | Building SNAT Flow entity for ip 10.10.5.9
2017-07-19 10:57:31,727 | WARN  | eChangeHandler-3 | FloatingIPListener               | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | No MAC address found for floating IP 10.10.10.9
2017-07-19 10:57:31,727 | WARN  | eChangeHandler-3 | NatUtil                          | 368 - org.opendaylight.netvirt.natservice-impl - 0.4.0.Carbon | getOptionalExternalSubnets - null subnetId
2017-07-19 10:57:31,729 | ERROR | eChangeHandler-3 | AsyncDataTreeChangeListenerBase  | 318 - org.opendaylight.genius.mdsalutil-api - 0.2.0.Carbon | Thread terminated due to uncaught exception: AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-3
java.lang.NullPointerException
        at org.opendaylight.netvirt.natservice.internal.VpnFloatingIpHandler.onAddFloatingIp(VpnFloatingIpHandler.java:134)[368:org.opendaylight.netvirt.natservice-impl:0.4.0.Carbon]
        at org.opendaylight.netvirt.natservice.internal.FloatingIPListener.createNATFlowEntries(FloatingIPListener.java:441)[368:org.opendaylight.netvirt.natservice-impl:0.4.0.Carbon]
        at org.opendaylight.netvirt.natservice.internal.FloatingIPListener.processFloatingIPAdd(FloatingIPListener.java:358)[368:org.opendaylight.netvirt.natservice-impl:0.4.0.Carbon]
        at org.opendaylight.netvirt.natservice.internal.FloatingIPListener.add(FloatingIPListener.java:103)[368:org.opendaylight.netvirt.natservice-impl:0.4.0.Carbon]
        at org.opendaylight.netvirt.natservice.internal.FloatingIPListener.add(FloatingIPListener.java:61)[368:org.opendaylight.netvirt.natservice-impl:0.4.0.Carbon]
        at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:156)[318:org.opendaylight.genius.mdsalutil-api:0.2.0.Carbon]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_131]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_131]
        at java.lang.Thread.run(Thread.java:748)[:1.8.0_131]