query_first_slave() error when trying to use vBulletin API outside of vBulletin

[nvitremi]

Here it is:

<?php
// https://vborg.vbsupport.ru/showthread.php?t=98009

// ######################## SET PHP ENVIRONMENT ###########################
error_reporting(E_ALL & ~E_NOTICE);

// ##################### DEFINE IMPORTANT CONSTANTS #######################
// change the line below to the actual filename without ".php" extention.
// the reason for using actual filename without extention as a value of this constant is to ensure uniqueness of the value throughout every PHP file of any given vBulletin installation.

define('THIS_SCRIPT', 'test');

// #################### PRE-CACHE TEMPLATES AND DATA ######################
// get special phrase groups
$phrasegroups = array();

// get special data templates from the datastore
$specialtemplates = array();

// pre-cache templates used by all actions
$globaltemplates = array(
        // change the lines below to the list of actual templates used in the script
        'pn_test',
);

// pre-cache templates used by specific actions
$actiontemplates = array();

// ########################## REQUIRE BACK-END ############################
$forumdir = $pnsite->getConfig('forumdir');
chdir($forumdir);
require_once('./global.php');
// I checked the "forumdir" above and the path is correct
// since the file "global.php" gets loaded.

// #################### HARD CODE JAVASCRIPT PATHS ########################
$headinclude = str_replace('clientscript', $vbulletin->options['bburl'] . '/clientscript', $headinclude);

// ########################################################################
// ######################### START MAIN SCRIPT ############################
// ########################################################################

$navbits = array(); 
// change the line below to contain whatever you want to show in the navbar (title of your custom page)
$navbits[$parent] = 'Test Page';

$navbits = construct_navbits($navbits);
eval('$navbar = "' . fetch_template('navbar') . '";');
print_output($navbar);

// change the line below to contain the name of the actual main output template used in your script
eval('print_output("' . fetch_template('pn_test') . '");');

I also cleared all my cookies for the site, thus I'm no longer logged in. I get different errors in this case:

Warning: array_keys() [function.array-keys]: The first argument should be an array in [path]/includes/functions.php on line 4088

Warning: Invalid argument supplied for foreach() in [path]/includes/functions.php on line 4088

( ! ) Fatal error: Call to a member function query_read_slave() on a non-object in /var/nvisionit/projects/precisionnutrition/www-newcms/forum/includes/functions.php on line 3093