How to fix Fatal error: Uncaught Error: Call to undefined function wp_is_development_mode()
The error message is a PHP fatal error, which occurs when the PHP interpreter encounters a situation it can’t recover from. In this case, the error is due to a call to an undefined function wp_is_development_mode() within the wp-includes/global-styles-and-settings.php file on line 394. Here’s a breakdown of the error: How to Fix: Remember, always backup…