Solution:
It looks like rss feeds are disabled in your site. Probably from a third party plugin or custom code in the theme.
Your attached image looks like the code in this article: http://www.wpbeginner.com/wp-tutorials/how-to-disable-rss-feeds-in-wordpress/
You might have some code in the theme like:
function wpb_disable_feed() {
wp_die( __(‘No feed available,please visit our <a href=”‘. get_bloginfo(‘url’) .'”>homepage</a>!’) );
}
add_action(‘do_feed’, ‘wpb_disable_feed’, 1);
add_action(‘do_feed_rdf’, ‘wpb_disable_feed’, 1);
add_action(‘do_feed_rss’, ‘wpb_disable_feed’, 1);
add_action(‘do_feed_rss2’, ‘wpb_disable_feed’, 1);
add_action(‘do_feed_atom’, ‘wpb_disable_feed’, 1);
add_action(‘do_feed_rss2_comments’, ‘wpb_disable_feed’, 1);
add_action(‘do_feed_atom_comments’, ‘wpb_disable_feed’, 1);
I hope it helps!