PHP Update Error

[Centurino]

Hi,

When updating the site PHP to version 7.4 I get the following errors. It runs on Genesis with the Business Pro theme and have tried disabling all plugins together and also tried a generic theme, but the issue remains. Could you point me in the right direction please as my host couldn't help.

"Fatal error: Uncaught Error: Call to undefined function trailingslashit() in /home/kingspar/public_html/wp-includes/class-wp-textdomain-registry.php:103 Stack trace: #0 /home/kingspar/public_html/wp-includes/l10n.php(784): WP_Textdomain_Registry->set('default', 'en_GB', '/home/kingspar/...') #1 /home/kingspar/public_html/wp-includes/load.php(1401): load_textdomain('default', '/home/kingspar/...', 'en_GB') #2 /home/kingspar/public_html/wp-includes/load.php(162): wp_load_translations_early() #3 /home/kingspar/public_html/wp-settings.php(37): wp_check_php_mysql_versions() #4 /home/kingspar/public_html/wp-config.php(98): require_once('/home/kingspar/...') #5 /home/kingspar/public_html/wp-load.php(50): require_once('/home/kingspar/...') #6 /home/kingspar/public_html/wp-admin/admin.php(34): require_once('/home/kingspar/...') #7 /home/kingspar/public_html/wp-admin/index.php(10): require_once('/home/kingspar/...') #8 {main} thrown in /home/kingspar/public_html/wp-includes/class-wp-textdomain-registry.php on line 103"

Thanks a lot

https://kingsparkleigh.co.uk/

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