Error installing Elgg 2.3

Hello! I'm back xD I'm trying to install the new Elgg version but I can't, I get this log:

 exception 'PDOException' with message 'SQLSTATE[HY000] [2002] No such file or directory' in /var/www/vhosts/licaweb.com/ebrpolitica/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:43, referer: http://ebrpolitica.com/install.php?step=database
[Sun Jan 15 05:55:37 2017] [warn]

 

I'm using PHP 5.6.7 , plesk panel, and MySQL  5.0.10