Error in PowerPoint Invoke Code

Hi Stefano, welcome to the forum.

You can add assembly references to your .xaml-files manually as described in this example for the DataSetExtensions reference: AsEnumerable is not a member of 'System.Data.Datatable' - #2 by loginerror

I don’t exactly know which reference you need though.

You can also try automating your PowerPoint presentation with UiPath activities. Check out PowerPoint packages and components from Go!

Cheers, Lukas