Facebook debugger giving image error messages starting recently

For some reason recently Facebook keeps not wanting to display our main image for the blogs we are sharing. It has just started happening again. This used to happen years ago.

Here are the error messages:

caution-solidWarnings That Should Be Fixed
Inferred Property
The 'og:image' property should be explicitly provided, even if a value can be inferred from other tags.
Missing Properties
The following required properties are missing: og:url, og:type, og:title, og:image, og:description, fb:app_id

Here is the blog I tried to submit today:

https://www.drcarney.com/blog/entry/managing-symptoms-vs-treating-the-illness

I had the same problem yesterday with a different blog. We try to share one blog on Facebook every day and really want the images to show up.

Thanks for any ideas you might have.

Sean Carney