I did not find the explanation of the problem here. My website is Smart Line. When I submit my link to web directory submission sites, I used to get the message This error message.
"The URL could not be validated. The page does not exist or the server could not be contacted. "
I've always tried to submit the site with http, www, without www. but the problem persists. How can I solve this problem? Are there any other web directories for sites enabled for https?
Please help me?