Structured data testing tool complains about image url (INVALID_URL)

I set the url for the image and I can see image by typing url in the browser, but structured testing tool complains about it. It should be mentioned that I am on development server with http protocol and without ssl certificate.

image url: http://s.my-site.local/u/2020/07/logo.png

How can I solve this error?

Update:

Here is the json-ld that I used:

{
  "@context": "http://schema.org/",
  "@type": "Organization",
  "@id": "http://my-site.local#Organization",
  "logo": "http://s.my-site.local/u/2020/07/logo.png",
  "identifier": "http://my-site.local#Organization",
  "name": "some name",
  "description": "some description",
  "url": "http://my-site.local"
}