php - Wordpress "white screen of death" on new posts and pages

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Developing a new site. I'm getting the white-screen-of-death every time I try to create a new page or post. I've deactivated all plugins, changed themes and tried 3 different versions of the wordpress core (6.0.2, 6.0.1, 5.9.8) to try and find a solution - nothing's working and all was fine yesterday. The error showing on the server logs is:

PHP Warning: Creating default object from empty value in /public_html/wp-admin/includes/post.php on line 742.

Can anyone suggest a solution? Is it an issue with the host server? Surely I've circumvented problems with the install by trying all of the above. I'm open to ideas.

Answer

Solution:

Have you tried to "reset" the .htaccess file? Sometimes the white screen is solved by doing this.

This should be in .htaccess inside the public_html folder.:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Also, can you share what's in /public_html/wp-admin/includes/post.php on line 742?

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