Couldn't connect to DB

1.
Db -> connect ( )
/home/eslgold/public_html/core/classes/db.class.php (Line: 11)

2.
Db -> __construct ( )
/home/eslgold/public_html/application/config/init.php (Line: 14)

3.
include ( /home/eslgold/public_html/application/config/init.php )
/home/eslgold/public_html/index.php (Line: 5)