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This does not look like an error, this is what is supposed to happen. You say this is a "Notice" not a "Warning" or "Error". I think they are just letting you know it is there.

Hi Ravi Basically, you want to instruct the web crawlers to visit only one version of the site.  You can do this my adding the following code into your .htaccess file: RewriteEngine on RewriteCond %{HTTP_HOST} !^www.your-domain.com$ RewriteRule ^(.*)$ http://www.your-domain.com/$1 [R=301] Obviously replace "your-domain.com" with whatever your URL is. That code will make sure you are redirected to the www. version of each page.  I'd ensure that every on-page link on your website links with the www. version for consistency, in order to avoid unneccesary redirects. Alternatively, if your site is running WordPress, installing the Yoast SEO Plugin will do this process for you automatically. Hope this helps.