Autodiscover - "User setting 'PreferredSite' is not available

Every time an outlook client connects to my internal mailbox/cas or external cas/outlook proxy I'm getting event:

Log Name:      Application
Source:        MSExchange Autodiscover
Date:          2011-03-25 13:56:42
Event ID:      1
Task Category: Web
Level:         Error
Keywords:      Classic
User:          N/A
Computer:     <exchange>
Description:
Unhandled Exception "User setting 'PreferredSite' is not available. "

Stack trace is empty so no details on event.

Everything works fine - autodiscover, outlook anywhere and internal clients can connect to Exchange.
I suppose those events start to appear after adding another DC on remote site.
Should I worry about server condition? How to get rid of those events?
LVL 3
mpilarczykAsked:
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endital1097Commented:
I would look at your AD Sites and Services and check what site names you have and ensure that all of your network subnets are associated with a site
Then run the Get-ClientAccessServer | fl Auto* to verify that it is handling all sites
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mpilarczykAuthor Commented:
That's it. AutodiscoverScope was set for "Default-First-Site-Name".
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