Ganaraja, there is a lot of data in these logs it would be helpful to know a timeframe for when the retrieval failure occurred along with the username used to perform the retrieval.
Were these family table objects failing retrieval? Are there any additional messages in the Event Manager within Creo?
I ask because I see the following in the log:
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: java.lang.NullPointerException
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: ERROR : com.ptc.windchill.uwgm.proesrv.rrc.RRCFamilyTableHelper - RRCFamilyTableHelper.processNeutralData :: Cannot retrieve family table neutral data
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: com.ptc.windchill.uwgm.common.conflict.UwgmErrorException
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: at com.ptc.windchill.uwgm.proesrv.util.J03NeutralDataHelper.createValue_J03(J03NeutralDataHelper.java:294)
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: at com.ptc.windchill.uwgm.proesrv.util.J03NeutralDataHelper.createEpmInstanceNeutralDataJ03(J03NeutralDataHelper.java:215)
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: at com.ptc.windchill.uwgm.proesrv.util.J03NeutralDataHelper.createEpmInstanceNeutralData(J03NeutralDataHelper.java:173)
Mon 5/19/14 08:25:51: SimpleTaskDispatcher89: at com.ptc.windchill.uwgm.proesrv.rrc.RRCFamilyTableHelper.processNeutralData(RRCFamilyTableHelper.java:921)
....
This type of message relates to retrieving family tables, and can cause retrieval failure, but I'm not sure if this is the data you are having trouble with.