issue with offline vault on client

Following errors is logged do you have any idea on this

07/08/2008 15:12:27.004[3764]: Initial Trawl custom property maybe false or doesn't exist
07/08/2008 15:12:27.005[3764]: Cannot start auto downloader as initial trawl is not yet complete.  When the offline trawl has completed make sure the Offline Store and mailbox are in synch.