Error occurred while retrieving the Facebook feed

I looked through the “Please read this topic before creating a new support ticket,” information because I got the Error occurred whiled retrieving FB…” message. I checked the items mentioned there. My Facebook page is a page, not a person. It shows that it is published. It has always worked correctly until the last day or so.

As you can see on the front page of https://adaction.org, it is unable to retrieve my client’s facebook feed.

Is this due to some new Facebook security measure? Is there something we can do to resolve this?

The page I need help with: [log in to see the link]