Problem with path names, probably.

I am trying to display the number of people in the (phpfreechat) chat room on another webpage.
Chat page: www.nzmotorhome.co.nz/NZMotorhomeChat/chat.php.
Other page: www.nzmotorhome.co.nz/directory/directory.php.
In chat.php I have

//next 7 lines of code from phpBB "Sessions Integration"
    define('IN_PHPBB', true);
    $phpbb_root_path = '../NZMotorhomeForum/';
//    $phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './';
    $phpEx = substr(strrchr(__FILE__, '.'), 1);
    include($phpbb_root_path . 'common.' . $phpEx);

    // Start session management
    $user->session_begin();
    $auth->acl($user->data);
    $user->setup();
.
.
.
.
$params["serverid"] = md5("ForumChat"); // calculate a unique id for this chat

Code (markup):

In directory.php I have

        <?php
            require_once dirname(__FILE__)."/chat/src/pfcinfo.class.php";
            $info  = new pfcInfo( md5("ForumChat") );
            // NULL is used to get all the connected users, but you can specify
            // a channel name to get only the connected user on a specific channel
            $users = $info->getOnlineNick(NULL);
            echo '<div align="center">';
            $info = "";
            $nb_users = count($users);
            if ($nb_users <= 0)
              $info = "<center>%d users in the Chat Room</center>";
            echo "</div>";
            echo "<div>";
            echo "<p>".sprintf($info, $nb_users)."</p>";
            echo "<ol>";
            foreach($users as $u)
            {
              echo "<li>".$u."</li>";
            }
            echo "</ol>";
            echo "</div>";
           ?>

Code (markup):

When I log in on chat.php and then open directory.php (note: the directory link on the chat page opens directory.html, not directroy.php), I get the following error

I've been trying to get this sorted. on and off, for weeks now. I feel it must be something really simple about defining paths that I don't understand.

Please can someone help me, or tell me what other information I need to provide.
This is just a test and eventually, when I get it going, I want to implement it in a phpBB3 overall-footer.php file.