Face Book Image Problems

hi SI Team

I am trying to post links for articles on FB

the article is here:

http://finalbug.net/blog/entry/404-in-depth-3d-titles-fcpx-10-2-part-1-of-3

ON FB I have the option to use images from previous articles such as:

http://finalbug.net/blog/entry/400-edit-in-resolve-the-fcp-way-part-01
http://finalbug.net/blog/entry/401-edit-in-resolve-the-fcp-way-part-02

When I go here:

https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Ffinalbug.net%2Fblog%2Fentry%2F404-in-depth-3d-titles-fcpx-10-2-part-1-of-3

I get the following message:

og:image was not defined, could not be downloaded or was not big enough. Please define a chosen image using the og:image metatag, and use an image that's at least 200x200px and is accessible from Facebook. Image 'http://finalbug.net/images/easyblog_images/62/2015FirstQuater/31032015_Resolve_Part02WEB.jpg' will be used instead.

The image that I am using is attached below.

Please advise what I am missing.

thanks

Paul