event log 6482 Sharepoint 2010

Hello,

I'm seeing lot of errors on my sharepoint servers with the event ID 6482.

Application Server Administration job failed for service instance Microsoft.Office.Server.Search.Administration.SearchServiceInstance (6f9b83c0-9cb2-4c3a-85de-2f35b9fca995).Reason: The specified user or domain group was not found.
Technical Support Details:
Microsoft.SharePoint.SPException: The specified user or domain group was not found. 
---> System.Security.Principal.IdentityNotMappedException: Some or all identity references could not be translated.
   at System.Security.Principal.NTAccount.Translate(IdentityReferenceCollection sourceAccounts, Type targetType, Boolean forceSuccess)
   at System.Security.Principal.NTAccount.Translate(Type targetType)
   at Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.GetProviderUserKeyClaim(IClaimsIdentity claimsIdentity, SPClaim loginClaim)
   --- End of inner exception stack trace ---
   at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize()
   at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob

Also in Central admin, when I go to, security --> General Security --> Configure service accounts, I'm getting the below error,

Some or all identity references could not be translated. 

I believe both these issues are related. So I have,

1. performed iisreset

2. rebooted the server

3. refresh the configuration cache

didnt help. Does any one please help me with this issue ASAP?

Appreciate your help!

Thanks,