public function showUserChannelsFan($user_id, $limit= null, $offset = null)
    {
        if (!is_numeric($user_id) || 0 >= $user_id) {
            throw new InvalidArgumentException(
                "ApiException::showUserChannelsFan user_id field should be positive integer");
        }

        if ($limit!= null && $limit < 1) {
            throw new InvalidArgumentException(
                "Api::showUserChannelsFan() limit must be a min 1 ");
        }
        if ($offset!= null && $offset < 0) {
            throw new InvalidArgumentException(
                "Api::showUserChannelsFan() $offset must be a positive number,  min 0 ");
        }

        /** @var $command \Guzzle\Service\Command\AbstractCommand */
        $command = $this->client->getCommand('GetFavoritesChannelsByUser', array('id' => $user_id,'limit'=>$limit,'offset'=>$offset));

        return $this->executeCommand($command);
    }