Please Help ! Your homepage cannot be indexed by search engines

Hello,

I am using your Yoast program, and to tell the truth I like it.

However, recently I have been confronted with this error: “Your homepage cannot be indexed by search engines. This is very bad for SEO and should be fixed.”

I tried everything, but did not solve the issue. I deactivated all the plugins, and tried to “Fetch the News Status” again but that did not solve the issue. My Robots.txt is not blocking indexation. Its content is as follows:
User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php

Sitemap:http://www.MYOWNWEBSITE.com/post-sitemap.xml
Sitemap:http://www.MYOWNWEBSITE.com/page-sitemap.xml
Sitemap:http://www.MYOWNWEBSITE.com/category-sitemap.xml

(My own website is a sample name !)

When I go to google and search whether my website is indexed or not by “site:website.com” Google shows that my pages and content is being indexed. The same case applied to other search engines like Yahoo and Bing.

The only way it goes off is when I uncheck the “Enable OnPage.org indexability check”. I don’t want to do that as I am still confused whether my website is indeed not indexed or this is a mere bug ?

Is there any solution to this issue ? I would appreciate any feedback.

Thanks a lot,

https://wordpress.org/plugins/wordpress-seo/