From the error messages it looks as if you haven't loaded the PowerCLI snapin.
Was that run from the PowerCLI prompt ?
Try loading the PowerCLI snapin like this
Add-PSSnapin VMware.VimAutomation.Core
Note that this is only one, albeit the most important one, of the PowerCLI snapins.
When you start the PowerCLI prompt, then a script will be executed automatically that loads all the PowerCLI snapins.