WordPress error 500 – Uncaught Error: Call to undefined function trailingslashit() in wp-includes/class-wp-textdomain-registry.php:103

When updating the plugins in a WordPress site prior to updating it from WordPress 6.0 to 6.1.1 the site halted with error 500. Investigating the logs I found “Uncaught Error: Call to undefined function trailingslashit() in wp-includes/class-wp-textdomain-registry.php:103

Solution

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