Errors 5553 & 7888 in event log

We have two errors that appear every hour in the event log on our MOSS 2007 server.  Would like to get these cleared up.  Below is the data:  

Event Type:      Error
Event Source:      Office SharePoint Server
Event Category:      User Profiles
Event ID:      5553
Date:            9/24/2008
Time:            7:00:04 AM
User:            N/A
Computer:      MOSSBOX
Description:
failure trying to synch site a05acbf8-9aa0-4b06-ba7e-64ca8bc7f7b0 for ContentDB a3d438c0-f4d9-4c5e-837c-4fcf01ff65f0 WebApp 6c6b2f68-ef56-4f1a-859b-3b8b7531db24.  Exception message was Cannot insert duplicate key row in object 'dbo.UserMemberships' with unique index 'CX_UserMemberships_RecordId_MemberGroupId_SID'.
The statement has been terminated..

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.



Event Type:      Error
Event Source:      Office SharePoint Server
Event Category:      Office Server General
Event ID:      7888
Date:            9/24/2008
Time:            7:00:04 AM
User:            N/A
Computer:      MOSSBOX
Description:
A runtime exception was detected. Details follow.
Message: Cannot insert duplicate key row in object 'dbo.UserMemberships' with unique index 'CX_UserMemberships_RecordId_MemberGroupId_SID'.
The statement has been terminated.

Techinal Details:
System.Data.SqlClient.SqlException: Cannot insert duplicate key row in object 'dbo.UserMemberships' with unique index 'CX_UserMemberships_RecordId_MemberGroupId_SID'.
The statement has been terminated.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.Office.Server.Data.SqlSession.ExecuteNonQuery(SqlCommand command)
   at Microsoft.Office.Server.UserProfiles.WSSSynchSqlSession.SynchExecuteNonQuery(SqlCommand cmd, Boolean throwOnFail)
   at Microsoft.Office.Server.UserProfiles.WSSSynchSqlSession.SynchExecuteNonQuery(SqlCommand cmd)
   at Microsoft.Office.Server.UserProfiles.SiteSynchronizer.WriteChangeLogConsumed()
   at Microsoft.Office.Server.UserProfiles.SiteSynchronizer.Synch()
   at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock)

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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