PHP WScript ERROR 500

PHP WScript
http://demo.phpwscript.com/

my web error 500
http://test1.ga

I am testing this script
but do not know if I buy it for bouncing me error 500
to try before you buy me wine with a base.sql
I imported it but always get error 500
What it is what may be happening?

config.
/application/config/database.php

Code:

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
$active_group = 'default';
$query_builder = TRUE;
$db['default'] = array(
    'dsn'    => '',
    'hostname' => 'localhost',
    'username' => 'c5phpz',
    'password' => '123456',
    'database' => 'c5phpz',
    'dbdriver' => 'mysql',
    'dbprefix' => 'WS_',
    'pconnect' => TRUE,
    'db_debug' => TRUE,
    'cache_on' => TRUE,
    'cachedir' => 'application/cache/others',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '{PRE}',
    'autoinit' => TRUE,
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

vi /var/log/ispconfig/httpd/test1.ga/error.log
is it clear