'YouTube Featured Video - error msg: Ooops, something seems to have gone wrong...

We have installed, activated, configured the'YouTube Featured Video' Plugin.

We can add the "YouTube Featured Video" widget to a page and give required info -- "title"and youtube "channel-name" (we also tried username). Following usage steps on https://premium.wpmudev.org/project/youtube-featured-video/

When we go to view the page we are seeing following message where the widget suppose to be at:
"Ooops, something seems to have gone wrong with rendering the widget"

url (to our test page): http://sikhtempleyc3.wpengine.com/basics-of-sikhi-2/

Please advise