seo – Can not add a website to the web directory submission sites?

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?