Joomla: Cannot instantiate non-existent class: jconfig

If you using Joomla 1.5.x and you get this error:

Fatal error: Cannot instantiate non-existent class: jconfig in /home/xxxxx/public_html/includes/framework.php on line 48

This means, you using OLD configuration.php (1.0.xx). Joomla 1.5.x configuration file has difference format.

To fix it, you must get original Joomla 1.5.xx configuration.php and reconfigure it as you need.
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This is how configuration.php of Joomla 1.5.xx look like. Very difference from Joomla 1.0.xx.

<?php
class JConfig1 {
var $offline = ‘0’;
var $editor = ‘none’;
var $list_limit = ’20’;
var $helpurl = ‘http://help.joomla.org’;
var $debug = ‘0’;
var $debug_lang = ‘0’;
var $sef = ‘0’;

……

……

var $MetaKeys = ‘joomla, Joomla’;
var $offline_message = ‘This site is down for maintenance. Please check back again soon.’;
}
?>