Google structured data tester gives the following error for the ImageObject property.
The value provided for image.url must be a valid URL.
However, image URL exists and has no problem. Any idea?
I am getting this error as well. I notice that Google structured data tester seems to have problems with image names containing .svg_ or .svg before the extension. e.g. 240px-Text-html_Gion.svg_.png or cloud.svg.jpg. When I truncate the image name to 240px-Text-html_Gion.png and use that image instead, it then works without error.