Database connection failed!

Stack Trace:

File: D:\home\site\wwwroot\classes\core\Application.inc.php line 38
Function: PKPApplication->__construct()

File: D:\home\site\wwwroot\lib\pkp\includes\bootstrap.inc.php line 58
Function: Application->__construct()

File: D:\home\site\wwwroot\index.php line 65
Function: require("D:\home\site\wwwroot\lib\pkp\includes\bootstrap.inc.php")