Подскажите, что за ошибка - Joomla 1.5: Настройка и оптимизация

314  // If the headers have been sent, then we cannot send an additional location header
315  // so we will output a javascript redirect statement.
316  if (headers_sent()) {
317  echo "<script>document.location.href='$url';</script>\n";
318  } else {
319  header($moved ? 'HTTP/1.1 301 Moved Permanently' : 'HTTP/1.1 303 See other');
320  header('Location: '.$url);
321  }
322  $this->close();