404 Error Message for sample-page that doesn't exist

I’m getting an error message from Google when they’re sending a robot to index the page. The message I get is: Googlebot can’t access your site.
The page they’re trying to index is: https://blog.renewable-marketing.com/sample-page/ which doesn’t exist when I go into WordPress to delete the page. How do I delete a page that doesn’t exist? My blog is: https://blog.renewable-marketing.com/ which does exist when I go to it.

Thanks!

Carla