“There doesn't seem to be a wp-config.php file.” despite wp-config.php in root

Question

I've encountered an odd problem and I'm not at all sure how to go about fixing it..

I have a site that was working fine until I changed a page title from "PRESS" to "BLOG." Now, when you visit the blog page, this error comes up:

There doesn't seem to be a wp-config.php file. I need this before we can get started. Need more help? We got it. You can create a wp-config.php file through a web interface, but this doesn't work for all server setups. The safest way is to manually create the file.

What's especially odd about this is, both wp-config.php and wp-config-sample.php are in the site root. Any ideas what's going on and how to remedy?

Thank you.