Critical Error After WordPress Core Update: Site Inaccessible

Issue Explanation:

Hi everyone,

I recently encountered a critical issue after updating my WordPress core to the latest version. My website, which was functioning perfectly before the update, is now completely inaccessible. When attempting to access the site, I receive the following error message:

“There has been a critical error on your website. Please check your site admin email inbox for instructions.”

I have attempted to troubleshoot the issue with the following steps:

1. Deactivating Plugins: I accessed my site via FTP and renamed the plugins folder to deactivate all plugins. This did not resolve the issue.
2. Switching Themes: I also renamed my active theme folder to switch to a default theme, but the error persists.
3. Debug Mode: I enabled WP_DEBUG in the wp-config.php file to get more information about the error. The debug log indicates issues with some core files, but I am unsure how to proceed.

I am seeking advice on how to:

1. Identify and resolve the root cause of this critical error.
2. Ensure a smooth update process in the future to avoid similar issues.

Any help or guidance from the community would be greatly appreciated! Thank you in advance.

The page I need help with: [log in to see the link]