请确保在'include / config.php'中指定了有效的MySQL数据库名称

Question

I've just downloaded cacti and I kept getting

FATAL: Cannot connect to MySQL server on 'localhost'. Please make sure you have specified a valid MySQL database name in 'include/config.php'

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This is what I have in include/config.php

$database_type = "mysql";
$database_default = "cacti";
$database_hostname = "localhost";
$database_username = "root";
$database_password = "***";
$database_port = "3306";
$database_ssl = false;

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What did I forget or did wrong ?