exchange 2013 installation error

Error:
The following error was generated when "$error.Clear(); 
          if ( ($server -eq $null) -and ($RoleIsDatacenter -ne $true) )
          {
            Update-RmsSharedIdentity -ServerName $RoleNetBIOSName
          }
        " was run: "There should only be a single RMS Shared Identity user. Found CN=FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042,CN=Microsoft Exchange System Objects, and CN=FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042,CN=Users,.".