Sitemap para foros phpbb2 en nuke

[coconut223]

Hace tiempo que no posteo nada asi que ante todo un saludete y ahora como no la pregunta
Tengo este generador de sitemap en mi pagina phpnuke 7.6 solo l tengo para los foros que es lo que suele cambiar a menudo pero en google me dice que existe espacios en blanco al inicio ¿sabeis en que parte del codigo se pueden generar esos espacios?

Código:

<?php
define('IN_PHPBB', true);
$phpbb_root_path = 'modules/Forums/';
include($phpbb_root_path . 'extension.inc');
include($phpbb_root_path . "common.$phpEx");

// Begin Configuration Section
$included_forum_ids = array(1, 2, 4, 7);
$excluded_forum_ids = array();
// End Configuration Section

if ( count($included_forum_ids) > 0 )
{
        $included_forum_ids_sql = 'forum_id IN (' . implode(', ', $included_forum_ids) . ')';
}

if ( count($excluded_forum_ids) > 0 )
{
        $excluded_forum_ids_sql = 'forum_id NOT IN (' . implode(', ', $excluded_forum_ids) . ')';
}

if ( ( count($included_forum_ids) > 0 ) && ( count($excluded_forum_ids) > 0 ) )
{
        $and = 'AND';
}

if ( ( count($included_forum_ids) > 0 ) || ( count($excluded_forum_ids) > 0 ) )
{
        $where = 'WHERE';
}

$sql = "SELECT topic_id, forum_id, topic_time, topic_type FROM " . TOPICS_TABLE . " $where $included_forum_ids_sql $and $excluded_forum_ids_sql ORDER BY topic_time DESC";

if ( !$result = $db->sql_query($sql) )
{
        message_die(GENERAL_ERROR, 'Error: could not retrive topic IDs', '', __LINE__, __FILE__, $sql);
}

$protocol = ( $board_config['cookie_secure'] == 0 ) ? 'http://' : 'https://';
$servername = $board_config['server_name'];
$port = ( $board_config['server_port'] == '80' ) ? '' : ':' . $board_config['server_port'];
$path = $board_config['script_path'];

$output = '<' . '?xml version="1.0" encoding="UTF-8"?' . '>' . "\n";
$output .= '<urlset xmlns="http://www.google.com/schemas/sitemap/0.84">'."\n";

while ( $row = $db->sql_fetchrow($result) )
{       $topic_id = $row['topic_id'];
        $forum_id = $row['forum_id'];
        $lastmodified = date('Y-m-d\TH:i:s+00:00', $row['topic_time']);
        $viewtopic = "postt$topic_id.html"; 
        $priority = ( $row['topic_type'] == POST_STICKY || $row['topic_type'] == POST_ANNOUNCE ) ? '1.0' : '0.5';
        $output .= "<url>\n";
        $output .= "\t<loc>$protocol$servername$port$viewtopic"  . "</loc>\n";
        $output .= "\t<lastmod>$lastmodified</lastmod>\n";
        $output .= "\t<changefreq>daily</changefreq>\n";
        $output .= "\t<priority>$priority</priority>\n";
        $output .= "</url>\n\n";
}
$output .= "</urlset>\n";

header('Content-type: application/xml');
echo $output;
?>