Erro When Connect Database, Please Help, terimakasih

A PHP Error was encountered
Severity: Warning
Message: pg_pconnect(): Unable to connect to PostgreSQL server: fe_sendauth: no password supplied
Filename: postgre/postgre_driver.php
Line Number: 153
Backtrace:
File: C:\xampp\htdocs\www\application\controllers\Home.php
Line: 5
Function: __construct
File: C:\xampp\htdocs\www\index.php
Line: 315
Function: require_once

A Database Error Occurred
Unable to connect to your database server using the provided settings.
Filename: C:/xampp/htdocs/www/system/database/DB_driver.php
Line Number: 436

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I presume you have checked your configuration? The error message suggests that you did not provide an expected password.