Get-VMGuestNetworkInterface Could not find file

Anyone know the fix on this error message? Is there really a GetVmGuestNetworkInterface_.bat? I only have _WindowsGuest.bat, _windows7Server64Guest.bat, _windows764Guest.bat and LinuxGuest.

Get-VMGuestNetworkInterface : 1/15/2013 2:58:43 PM    Get-VMGuestNetworkInterfa
ce        Could not find file 'C:\Program Files (x86)\VMware\Infrastructure\vSp
here PowerCLI\Scripts\GetVmGuestNetworkInterface_.bat'.
At C:\data\techops\ProductOperations\Scripts\MigrateTo-vCloud.ps1:451 char:61
+                         $guestnetintf = $newvcvm | Get-VMGuestNetworkInterfac
e <<<<  -HostUser $esxserver.Username -HostPassword $esxserver.Password -GuestU
ser $vm.GuestID -GuestPassword $vm.GuestPwd | Select -First 1 | %{$_.Name}
    + CategoryInfo          : NotSpecified: (:) [Get-VMGuestNetworkInterface],
    ViError
    + FullyQualifiedErrorId : Client20_VmGuestServiceImpl_UploadFileToGuest_Vi
   Error,VMware.VimAutomation.ViCore.Cmdlets.Commands.GetVmGuestNetworkInterf
  ace

I only encountered this error when i run my script but not when i do it manually.

Originally i created the script on 5.0 and i only encountered this error now after upgrading to 5.1

Not sure if it matters but i am switching to STA mode in the script.

The Guest OS of the VM i am running against is Windows 2008 R2 64bit.

I have the following PowerCLI version

and Running against vCenter Server, 5.1.0, 880146

Thanks in advance.