Article Schema Error

I’m using the Article schema on my site and there is 1 error when tested in the google testing tool at https://search.google.com/structured-data/testing-tool. It shows “A value for the image field is required.” How do I fix that? Here is the URL I’m using for input to the test tool http://perfecthealthpill.com/how-showering-at-night-helps-you-sleep.

Also, the test tool detected a “Blog” schema with 5 errors and 2 warnings. I don’t even have a Blog schema and no other JSon-LD plugins installed on this site. Do you know what may be detecting the Blog schema and how to remove it?

Does your plug-in help to get more visibility in the search engines?