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Prepare schema failed - Active Directory operation failed on The object already exists.".

When trying to upgrade Exchange 2010 to SP3 I received the error failed when trying to update the schema.

The following error was generated when "$error.Clear(); install-AdministrativeGroup -DomainController $RoleDomainController


Active Directory operation failed on xxx The object already exists.".

Any suggestions?
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artcrest
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artcrest
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