problem with wordpress

[ Moderator note: moved to Fixing WordPress. ]

i’m dummy.when i want to open localhost/wordpress i face this error:
Fatal error: Uncaught Error: Call to undefined function get_bloginfo() in C:\xampp\htdocs\wordpress\wp-includes\class-wp-locale.php:233 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-includes\class-wp-locale.php(113): WP_Locale->init() #1 C:\xampp\htdocs\wordpress\wp-includes\load.php(925): WP_Locale->__construct() #2 C:\xampp\htdocs\wordpress\wp-includes\wp-db.php(1098): wp_load_translations_early() #3 C:\xampp\htdocs\wordpress\wp-includes\wp-db.php(1618): wpdb->select(‘mahdi’, Object(mysqli)) #4 C:\xampp\htdocs\wordpress\wp-includes\wp-db.php(658): wpdb->db_connect() #5 C:\xampp\htdocs\wordpress\wp-includes\load.php(404): wpdb->__construct(‘root’, ”, ‘mahdi’, ‘localhost’) #6 C:\xampp\htdocs\wordpress\wp-settings.php(107): require_wp_db() #7 C:\xampp\htdocs\wordpress\wp-config.php(89): require_once(‘C:\\xampp\\htdocs…’) #8 C:\xampp\htdocs\wordpress\wp-load.php(37): require_once(‘C:\\xampp\\htdocs…’) #9 C:\xampp\htdocs\wordpress\wp-blog-header.php(13): require_once(‘C:\\xampp\\htdocs…’) #10 C:\xampp\htdocs\wordpress\ in C:\xampp\htdocs\wordpress\wp-includes\class-wp-locale.php on line 233

what should i do?