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Fatal error: require(): Failed opening required '/var/www/html/wp-includes/navigation-fallback.php' (include_path='.:/usr/share/php') in /var/www/html/wp-settings.php on line 350

Fatal error: Uncaught Error: Call to a member function set() on null in /var/www/html/wp-includes/l10n.php:806 Stack trace: #0 /var/www/html/wp-includes/l10n.php(900): load_textdomain() #1 /var/www/html/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /var/www/html/wp-includes/l10n.php on line 806