phpNuke Help

i just installed php nuke on my server [url]http://derango.patcon.com.au/html[/url] I followed the tutorial and have installed the sql file using the PHPmyAdmin after doing that i configured the config.php code using the following format

[code=php]<?php
dbhost = “patcon.com.au”;
$dbuname = “patco_dera”;
$dbpass = “mypassword”;
$dbname = “patco_nuke”;
$system = 0;
$prefix = “nuke”;
?>[/code]

Then the tutorial on installing this tells me to go to the admin.php once all this is done, I go to the admin.php and it comes up with this error

[code=php]Fatal error: Cannot instantiate non-existent class: sql_db in /home/patco/public_html/derango/html/db/db.php on line 86[/code]

And when i look at line 86 on the page it is this

[code=php]$db = new sql_db($dbhost, $dbuname, $dbpass, $dbname, false);[/code]

Does any body know if ive left out anything or if some part of the code is not right?? anything to help is welcome ?

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