Service 'MSExchangeADTopology' failed to reach status 'Running' while installing Hub transport role of exchnage server 2010 sp1 on Window Server 2008 r2

Hi

Getting this error while installing hub transport role of exchange server 2010 sp1 on window server 2008 R2.

Hub Transport Role
Failed

Error:
The following error was generated when "$error.Clear();
          if ($exsSid -eq $null -or $exsSid -eq "")
          {
          $exsSid = get-ExchangeServerGroupSID -DomainController $RoleDomainController
          }
          start-setupservice -ServiceName MSExchangeADTopology -ServiceParameters $exsSid,$RoleDomainController
        " was run: "Service 'MSExchangeADTopology' failed to reach status 'Running' on this server.".

Service 'MSExchangeADTopology' failed to reach status 'Running' on this server.
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex88D115&l=0&cl=cp

Elapsed Time: 00:25:35