Invoke-PnPSiteTemplate causes an object reference not set to an instance of an object error at Line 1 Character 1

If I try - Invoke-PnPSiteTemplate -Path C:\template.pnp -Parameters @{'CompanyName' = $companyName; 'Year' = $year; 'Month' = $month } as per the New PowerApps Communications Template - https://learn.microsoft.com/en-us/power-platform/guidance/adoption/wiki-community I get an error 👎 Invoke-PnPSiteTemplate : Object reference not set to an instance of an object.
At line:1 char:5

• Invoke-PnPSiteTemplate -Path C:\template.pnp -Parameters @{'Compa ...
  

• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

  • CategoryInfo : WriteError: (:) [Invoke-PnPSiteTemplate], NullReferenceException
  • FullyQualifiedErrorId : EXCEPTION,PnP.PowerShell.Commands.Provisioning.Site.InvokeSiteTemplate

If I just type PS C:> Invoke-PnPSiteTemplate
Invoke-PnPSiteTemplate : Object reference not set to an instance of an object.
At line:1 char:1

• Invoke-PnPSiteTemplate

•   + CategoryInfo          : WriteError: (:) [Invoke-PnPSiteTemplate], NullReferenceException
    + FullyQualifiedErrorId : EXCEPTION,PnP.PowerShell.Commands.Provisioning.Site.InvokeSiteTemplate
  
  

So this looks like an issue with Invoke-PnPSiteTemplate.

Anybody any ideas why ? Have I missed something ?

Should PnP.Framework be here somewhere ? I cannot seem to install it.

Thanks

Nigel

Start by reproducing the failure with the shown Invoke-PnPSiteTemplate command, both with and without -Path and -Parameters, and review the linked New PowerApps Communications Template guidance. Trace the Invoke-PnPSiteTemplate entry point to identify why it raises NullReferenceException; done means the cause and required invocation or configuration are established and covered by a regression test.