Instagram widget returning invalid data

This widget was working properly until the last 2 months or so. It used to display a feed of my latest Instagram posts at the bottom of my home page but now all it says is “Instagram has returned invalid data.”

I originally installed it under Customize > Widgets > Instagram. All I had to do was type in @username or #hashtag and the content will load.

My wordpress is up-to-date. Is there anything else I can do to get this to work like before?

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