Where are class files located and how to connect them to Bitrix?

Question

1C-Bitrix

There was a task to transfer the functionality from one Bitrix to another, but during the transfer the following error occurred
Fatal error: Class 'HtcCs\InvestPortal\BitrixComponent\ApiRouter' not found in /var/www/www-root/data/www/81.436.83.39/ local/components/htccs/investportal.api.router/class.php on line 16
And here is the code of the file itself, or rather its beginning

<?php

namespace HtcCs\InvestPortal\BitrixComponent;

use HtcCs\InvestPortal\BitrixTools\Services\Iblock;
use HtcCs\InvestPortal\Config\IblockCodes;
use HtcCs\InvestPortal\Config\IblockTypeCodes;
use HtcCs\InvestPortal\Config\PropertyCodes;
use Bitrix\Iblock\ElementTable;

/**
 * Роутер для api карты
 * Class InvestPortalApiRouter
 * todo отрефакторить жирные методы
 */
class InvestPortalApiRouter extends ApiRouter
{

If I understand correctly, then this class is located in the following file.
/local/src/BitrixComponent/ApiRouter.php

<?php

namespace HtcCs\InvestPortal\BitrixComponent;

use Bitrix\Main\Context;
use Bitrix\Main\HttpResponse;

/**
 * Class Router
 * @package HtcCs\InvestPortal\BitrixComponent
 */
class ApiRouter extends \CBitrixComponent
{

The files were transferred by analogy, with one caveat, on the source site, the main Bitrix script and the site itself are divided into different directories, and on the final site in one directory.

Answer 1

It is possible that your new project does not have a class autoloader. There should be an autoload.php file in the php_interface directory (maybe in another place), it is included in init.php