Cannot understand WordPress error message

The error I am getting is:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'wptexturize' not found or invalid function name in /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/class-wp-hook.php on line 294

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'wptexturize' not found or invalid function name in /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/class-wp-hook.php on line 294

Fatal error: Uncaught Error: Call to undefined function wptexturize() in /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/general-template.php:1240 Stack trace: #0 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/general-template.php(1261): wp_get_document_title() #1 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/class-wp-hook.php(292): _wp_render_title_tag('') #2 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/class-wp-hook.php(316): WP_Hook-apply_filters(NULL, Array) #3 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/plugin.php(484): WP_Hook-do_action(Array) #4 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/general-template.php(3009): do_action('wp_head') #5 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-content/themes/flatsome/header.php(10): wp_head() #6 /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/template.php(730): require_once('/home/ifd6vop3y...') #7 /home/ifd6vop3yes7/public_html/thematchca in /home/ifd6vop3yes7/public_html/thematchcandleco.com/wp-includes/general-template.php on line 1240

It breaks the website. I have searched for days with no results and I am at my wit's end.

I am a c# asp.net guy, not a PHP guy so I cannot for the life of me figure out what is going on. As long as my site is down I am not getting orders. I can do a backup to a version that works, but then I lose 50% of my woocommerce orders and I don't want that obviously. Can someone tell me what the heck is going on?

Topic 500-internal-error fatal-error Wordpress

Category Web

1
answered at

You might want to look at disabling the use of wptexturize() - check out this WPDevSE post Safe to disable wptexturize? to see if it will help your situation.

1
answered at

I did a rollback to WordPress 5.5.5 the hard way via FTP and running the upgrade and that seemed to fix it. I then did an immediate backup of the site so I can roll back to that if need be. I tried disabling all plugins and changing the theme in the database before downgrading and none of that worked so I can only figure it was something to do with WordPress core itself. My understanding is that 'wptexturize' is a WordPress function that converts single quotes into double-quotes for some reason but not completely sure about that which is what made me think it was something to do with WordPress Core. I will try and do a manual update to the latest version later since I spent all day doing this, lol.]

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