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This error will received if the Windows API LookupAccountSid function failed.
A detailed description is available at: <http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/lookupaccountsid.asp>.
Possible causes: Invalid SID (was valid at mapping time but not at migration time), domain controller(s) down (so the program cant resolve SID), SID might be from another (trusted) domain and it�s DCs are down, or it is not connected at migration time, assorted network errors.
For more help on this issue, please contact the Quest Support Technical Team.