Adding a newsletter object to your site.

In your /data/WebGUI/etc/conf file, you need to add:

"WebGUI::Asset::Wobject::Collaboration::Newsletter"

To your list of available assets, and restart apache.

 "assets" : [
      "WebGUI::Asset::Snippet",

...

      "WebGUI::Asset::Wobject::Calendar",
      "WebGUI::Asset::Wobject::Collaboration::Newsletter"
   ],