When I update the wordpress 6.2, the process is not completed, and website returend critical warninig mode.-There has been a critical error on this website.-

When you click the site you will see this message..

Warning: mysqli_real_connect(): Headers and client library minor version mismatch. Headers:50651 Library:50552 in /home/s6it9u174f90/public_html/wp-includes/class-wpdb.php on line 1775

Warning: require(/home/s6it9u174f90/public_html/wp-includes/html-api/class-wp-html-attribute-token.php): Failed to open stream: No such file or directory in /home/s6it9u174f90/public_html/wp-settings.php on line 237

Fatal error: Uncaught Error: Failed opening required ‘/home/s6it9u174f90/public_html/wp-includes/html-api/class-wp-html-attribute-token.php’ (include_path=’.:/opt/alt/php81/usr/share/pear:/opt/alt/php81/usr/share/php:/usr/share/pear:/usr/share/php’) in /home/s6it9u174f90/public_html/wp-settings.php:237 Stack trace:

0 /home/s6it9u174f90/public_html/wp-config.php(93): require_once()

1 /home/s6it9u174f90/public_html/wp-load.php(50): require_once(‘/home/s6it9u174…’)

2 /home/s6it9u174f90/public_html/wp-blog-header.php(13): require_once(‘/home/s6it9u174…’)

3 /home/s6it9u174f90/public_html/index.php(17): require(‘/home/s6it9u174…’)

4 {main} thrown in /home/s6it9u174f90/public_html/wp-settings.php on line 237

Notice: Function is_embed was called incorrectly. Conditional query tags do not work before the query is run. Before then, they always return false. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /home/s6it9u174f90/public_html/wp-includes/functions.php on line 5835

Notice: Function is_search was called incorrectly. Conditional query tags do not work before the query is run. Before then, they always return false. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /home/s6it9u174f90/public_html/wp-includes/functions.php on line 5835

\> Warning: mysqli_real_connect(): Headers and client library minor version mismatch. Headers:50519 Library:50633 in /home/content/n3pnexwpnas02_data03/68/3523068/html/wp-includes/wp-db.php on line 1529

Hello my name is Rajiv Sharma and I am the founder of RESEARCH & ME_mechscinovate which is my creativity, innovations, research and designs based blog. •Engineer•Inventor•Researcher•Designer•Author• Education Designing a all new PhD. course although I have not a PhD. B.Eng. in Mechanical Aug 2010-Aug 2013, Punjab, India Diploma in Mechanical Engineering May 2007-May 2010, Punjab, India Experience Freelance Creative Engineer, Inventor, Researcher, Innovator & Designer 2008 – Present Machine optimization & maintenance Engineer Dec 2014 – Present, Ludhiana, India Lecturer in Mechanical Engineering August 2013 – 2014, Punjab, India

So sorry to hear the inconvenience. Just to make sure no plugin is conflicting and causing this, can you please do a plugin conflict test? That is – temporarily deactivate all plugins and check if this works. If yes, start enabling plugins one by one and check at which point the issue comes back. Skip that one and continue.

Please let me know the result.

Also, can you please turn on debug mode in WordPress? To enable it, open your wp-config.php file and look for define(‘WP_DEBUG’, false);. Change it to:

define('WP_DEBUG', true);

Also add the following lines there: define( 'WP_DEBUG_LOG', true ); define( 'WP_DEBUG_DISPLAY', false );

The errors will be saved to a debug.log log file inside the /wp-content/directory.

The wp-config.php is located in your WordPress root directory. It’s the same file where the database configuration settings are. You will have to access it by FTP or SFTP in order to edit it.

Paste the errors here. If the file is very long, paste them to a text file and attach it with your reply.

en WordPress.com Forums Warning: mysqli_real_connect(): Headers and client library minor version mismatch. Headers:50636 Lib

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This is also preventing people from getting to their wp-admin login pages, so it is a pretty tricky thing to fix for most non-technical WordPress users.

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Yesterday I spent several hours working on this, including talking with the hosting companies of the clients who had this problem.

Note: if you are on one of my After Sales Service plans, and you have this problem, please note that I am working my way through all the sites and checking them. You can greatly speed up the process for me by alerting me that you have the problem, via my Help Desk.

What is causing this mysqli_real_connect problem?

The problem has been varying among the sites I have been seeing it on. In some cases, there is a database table corruption. To fix this, I have been restoring the corrupted table (usually a Wordfence options table) to the last backup. And of course, all my clients who have the After Sales Service plans have a great regime of backups in place.

It is also a good idea to update WordFence to the latest version. Of course, if you can’t get into your wp-admin, this won’t be possible, so you will have to do it via ftp.

Another possible solution can be to restart Apache on the server. But so many of my clients are on shared servers, and this is not something that is done through cPanel. The hosting companies are reluctant to restart Apache on a shared server, because this means all the sites that are on that server will go down briefly. But, if you are not on a shared server, and have access to WHM or SSH command line, you can restart Apache there.

The next step, if none of the above has resolved it, is to do the old standard of disabling the plugins one at a time to see what is causing this. In some cases, there was actually more than one error message appearing, so disabling the plugins resolved some problems but not all of them. The “mysqli_real_connect(): Headers and client library minor version mismatch” error message has the added bonus that it then affects the header display, so this prevents access to wp-admin login.

The last thing I found was that I needed to ensure that debugging was disabled. The “mysqli_real_connect(): Headers and client library minor version mismatch” error message is actually a warning, not an error. So disabling WordPress debug removes the error message, which then allows access to wp-admin.

I hope this helps you to resolve the problem! Remember, if you are just looking for someone to fix this for you, and need it done in a hurry, scroll up a bit and see where I can do it for you very promptly for just $200. I also offer ongoing monitoring of your website (for extra cost) so that problems like this will be sorted very quickly – usually even before you know they exist.