Installed mini portal getting error?

// Fetch $show topics
    $result = $db->query('SELECT t.id, t.poster, t.subject, t.posted, t.last_post, f.id AS fid, f.forum_name FROM '.$db_prefix.'topics AS t INNER JOIN '.$db_prefix.'forums AS f ON t.forum_id=f.id WHERE f.id='.$fid.' AND t.moved_to IS NULL ORDER BY '.$order_by.' DESC') or error('Unable to fetch topic list', __FILE__, __LINE__, $db->error());
    $show_count = 0;
    if ( !$db->num_rows($result) ) return $output;
    while ( ($show_count < $show) && ($cur_topic = $db->fetch_assoc($result)) ) {
        $temp = '';
        if ($pun_config['o_censoring'] == '1')
            $cur_topic['subject'] = censor_words($cur_topic['subject']);
        if (pun_strlen($cur_topic['subject']) > $max_subject_length)
            $subject_truncated = trim(substr($cur_topic['subject'], 0, ($max_subject_length-5))).' ...';
        else
            $subject_truncated = $cur_topic['subject'];
        $newsheading = '<a href="'.$pun_config['o_base_url'].'/viewtopic.php?id='.$cur_topic['id'].'&action=new" title="'.pun_htmlspecialchars($cur_topic['subject']).'">'.pun_htmlspecialchars($subject_truncated).'</a> - <em>Posted by '.$cur_topic['poster'].' at '.date('h:i A', $cur_topic['posted']).'</em><br>';
        // Group posts by date    
        $thisdate = date('l, d F Y', $cur_topic['posted']);
        if ($thisdate != $saveddate) 
        {
            if ($saveddate)
            {
                $temp .= "</div></div>";