ERROR

Couldn't connect to database server : localhost
Fatal error: Database error in "D:\Domains\nhasachkienthuc.com\wwwroot\common\mysql.php" on line D:\Domains\nhasachkienthuc.com\wwwroot\common\mysql.php

in D:\Domains\nhasachkienthuc.com\wwwroot\common\mysql.php on line 0