нет доступа к базе данных в Moodle

Я использую moodle и меняю местоположение своего веб-сайта, но сталкиваюсь с этой ошибкой.

Мой config.php:

dbtype    = 'mysql';
$CFG->dbhost    = 'localhost';
$CFG->dbname    = 'lightsys_test';
$CFG->dbuser    = 'lightsys_test';
$CFG->dbpass    = '123456a';
$CFG->dbpersist =  false;
$CFG->prefix    = 'mdl_';

$CFG->wwwroot   = 'http://www.lightsystem.ir/aya/moodle';

$CFG->dirroot   = '/home/lightsys/public_html/aya/moodle';
$CFG->dataroot  = '/home/lightsys/public_html/aya/moodledata';
$CFG->admin     = 'admin';

$CFG->directorypermissions = 00777;  // try 02777 on a server in Safe Mode

require_once("$CFG->dirroot/lib/setup.php");
// MAKE SURE WHEN YOU EDIT THIS FILE THAT THERE ARE NO SPACES, BLANK LINES,
// RETURNS, OR ANYTHING ELSE AFTER THE TWO CHARACTERS ON THE NEXT LINE.
// /home/lightsys/public_html/aya/moodle/
?>

И моя ошибка:

Error: Database connection failed.

It is possible that the database is overloaded or otherwise not running properly.

The site administrator should also check that the database details have been correctly specified in config.php