No configuration file found and no installation code available. Exiting

I am getting the following error when I try to access my WordPress website. It was working quite fine previously. Could anyone help me on this.

No configuration file found and no installation code available. Exiting…

In WordPress there will be a default wp-config.php file and I think this has been missing from your package. Please Check if it is there, else create a new one with file name wp-config.php and Place the following code in it with appropriate Database Credentials.

<?php
// ** MySQL settings ** //
define('DB_NAME', 'DATABASE-NAME');    // The name of the database
define('DB_USER', 'DATABASE-USERNAME');     // Your MySQL username
define('DB_PASSWORD', 'DATABASE-PASSWORD'); // ...and password
define('DB_HOST', 'localhost');  
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');

// You can have multiple installations in one database if you give each a unique prefix
$table_prefix  = 'wp_';   // Only numbers, letters, and underscores please!

// Change this to localize WordPress.  A corresponding MO file for the
// chosen language must be installed to wp-content/languages.
// For example, install de.mo to wp-content/languages and set WPLANG to 'de'
// to enable German language support.
define ('WPLANG', '');

/* That's all, stop editing! Happy blogging. */

define('ABSPATH', dirname(__FILE__)."https://wordpress.stackexchange.com/");
require_once(ABSPATH.'wp-settings.php');
?>