Invalid URL. But it looks OK.

During Bulk Image Optimization (from Media Library): “There was an error and your request was not processed. (Invalid URL. Please make sure the URL is properly urlencoded and points to a valid image file.) 5404_91.jpg”

My URL is: https://carloversjournal.com/wordpress/wp-content/uploads/2016/12/5404_161.jpg Looks fine. Advice?

I set my permissions (temporarily) to 777.

Anxiously awaiting the solution. Thanks