SharePoint: How to Fix "Failure trying to synch web application"

Error message on Event Log:


Failure trying to synch web application 986c87c1-66b0-4655-972f-f62a32fcd431, ContentDB 91725678-be7e-4c0b-b4d8-db7c747875b2 Exception message was A duplicate site ID 2631c92c-92dc-44b2-ae6d-1b7b8ecb8ad5(http://someserver:41772) was found. This might be caused by restoring a content database from one server farm into a different server farm without first removing the original database and then running stsadm -o preparetomove. If this is the cause, the stsadm -o preparetomove command can be used with the -OldContentDB command line option to resolve this issue.

Resolution:

• Verify all the data has been synchronized for the user profiles. (On my sample - 2 days)

          Stsadm -o sync -listolddatabases 2

• If old data exists, run the following command

         Stsadm -o sync -deleteolddatabases 2