Wordpress Core is causing 500 internal server error

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We are facing this error: PHP Fatal error: Uncaught Error: Call to undefined function get_locale() in /var/www/html/wp-includes/l10n.php:137 Stack trace: #0 /var/www/html/wp-includes/l10n.php(828): determine_locale() #1 /var/www/html/wp-includes/class-wp-fatal-error-handler.php(46): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in…

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