A Database Error Occurred

[eluser]ogib[/eluser]
Hi friends,
I have a project that upload in 000webhost.com.
Database configured as follows:

Code:

$db['default']['hostname'] = 'server30.000webhost.com';
$db['default']['username'] = 'username';
$db['default']['password'] = 'pass';
$db['default']['database'] = 'database_name';

However, it gives me an error:
Unable to connect to your database server using the provided settings.
Filename: core/Loader.php
Line Number: 346

Where is my mistake? Please help!