User profile Replication Engine Issue - Help needed

Hi,
One of our colleague faced the issue as below
We are getting the below error in the log when we run the incremental replication(replicates user profile data/social data across different FARMs) hence we need to refresh the token. However, not sure how to refresh the Change token. Any help in this regard would be great.

Error on the pull from: https://abc.com
Destination Server: https://def.com
Change Token: 1;1867424;12/26/2011 10:38:06
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> The change token provided preceeds the earliest change available.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at Microsoft.Office.Server.AdministrationToolkit.ReplicationEngine.UserProfileChangeWebService.UserProfileChangeService.GetChangesWithRemotePersonalSiteHostUrl(String changeToken, UserProfileChangeQuery changeQuery)
at Microsoft.Office.Server.AdministrationToolkit.ReplicationEngine.IncrementalReplicator.PullUserProfileChanges(String changeToken)
at Microsoft.Office.Server.AdministrationToolkit.ReplicationEngine.IncrementalReplicator.Start()
3/2/2012 5:59 PM
User profile service incremental replication reached max number of retry and stopped.
Finally after doing some Google search,I gave reply as below
Hi Surendra,

This is with the changetoken getting out of sync.
You can try with refresh or stop start incremental sync.
please glance the below article for your reference.

http://blogs.technet.com/b/tapanm/archive/2009/07/15/understanding-user-profile-replication-engine.aspx