I'm having problems with a custom theme and pages on the front end other than the home page displaying:
There has been a critical error on this website.
This error message is displayed on an error page that includes the site's main navigation in the same style as the rest of the site and the site's logo.
I've tried all the recommended methods for getting error messages to display, i.e.
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_DISPLAY', false );
define( 'WP_DEBUG_LOG', true );
and can't get anything to display.
The weird thing is that only some of the pages were displaying the error initially until I tried changing themes to see if it would fix the broken pages (it did) but then when I switched back to the custom theme again, that's when all the other pages started displaying the same error page too. It's like cached versions of the pages are somehow being displayed.
Just to see what would happen, I removed the custom theme folder altogether, but the pages are still showing the same error page. And in themes.php the theme is still there and can be activated.
How can the theme still be displaying if it's not even in the themes folder anymore? :?
Edit: I can even edit the theme files in WP's theme editor even though the theme folder isn't there. How is that even possible?