I'm afraid the problem is still the same: I looked at your 2 last posts, and Facebook returned the same error message for all 2 images inserted in these posts:
https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fwww.liberonetwork.com%2Ftherapy-for-anxiety
https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fwww.liberonetwork.com%2Fthe-value-of-therapy
Provided og:image is not big enough. Please use an image that's at least 200x200 px.
However, in both cases the image was larger than 200x200px.
Have you tried to deactivate the "Default featured image" plugin?
If that didn't help either, I'm afraid there isn't much more we can do to help. I would suggest that you contact Facebook for help, and give them to examples I listed above:
https://developers.facebook.com/support/
Only they will be able to say why Facebook isn't able to recognize the images you've inserted into your posts.
I hope this helps.