Upfront and Reader

I am new to Upfront and so far really like it. I assume it just isn't compatible yet but I can not get the multi-site Reader to display content in the widget on an Upfront theme.

So on a page and using the Upfront editor I add a widget. I make the widget a "Reader: Recent Posts" widget. No matter what options I get the error of "Ooops, something seems to have gone wrong with rendering the widget".

Is there any way to make this work with Upfront?