Image Builder cmdlet Add-EsxSoftwareDepot?

Hi,

I am trying to setup and run image builder and am following the VMware site Image Builder documentation.

After installing the 5.0 version of the PowerCLI on Windows 7 and starting PowerCLI, I tried the command syntax below.

     Add-EsxSoftwareDepot -DepotUrl C:\file_path\offline-bundle.zip

But I got an error indicating:

     The Term 'Add-EsxSoftwareDepot' is not recognized as the name of a cmdlet....

What still needs to be set up in order to get the cmdlet Add-EsxSoftwareDepot?

Thanks,

Jyh-shing