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<?php 
use Bitrix\Main\Loader;
use Bitrix\Main\Localization\Loc,
    Bitrix\Main\ModuleManager,
    Bitrix\Main\EventManager,
    Bitrix\Main\Application;
 
Loader::includeModule("mycompany.files");
 
use Mycompany\Files\Helpers\Debuger;
    
Loc::loadMessages(__FILE__);
 
class Mycompany_files extends \CModule
{
       public function __construct()
    {
        $this->MODULE_ID = 'mycompany.files';
        $this->setVersionData();
 
        $this->MODULE_NAME = Loc::getMessage("MYCOMPANY_FILES_WATCHING_MODULE_NAME");
        $this->MODULE_DESCRIPTION = Loc::getMessage("MYCOMPANY_FILES_WATCHING_MODULE_DESC");
 
        $this->PARTNER_NAME = Loc::getMessage("MYCOMPANY_FILES_WATCHING_PARTNER_NAME");
        $this->PARTNER_URI = Loc::getMessage("MYCOMPANY_FILES_WATCHING_PARTNER_URI");
 
        $this->SHOW_SUPER_ADMIN_GROUP_RIGHTS = 'Y';
        $this->MODULE_GROUP_RIGHTS = 'Y';
    }
 
    public function doInstall()
    {
        //Главный модуль, миграции, и rest проверяем, установлены ли они
        if (!$this->isRequiredModulesInstalled()) {
            return false;
        }
        $this->installFiles();
        $this->installDB();
        $this->installEvents();
        
 
        return true;
    }
 
    //Регистрируем обработчики событий
    public function installEvents()
    {
        $eventManager = EventManager::getInstance();
        $eventManager->registerEventHandler('main', 'OnFileSave', $this->MODULE_ID,
            '\Mycompany\Files\Event\Files', 'OnFileSaveHandler');
 
 
        $handlers[] = EventManager::getInstance()->findEventHandlers("main", "OnFileSave");
        try {
            Debuger::dbgLog('events:', '_moduleEvents');//Вот тут ошибка Class "Mycompany\Files\Helpers\Debuger" not found
            Debuger::dbgLog($handlers, '_moduleEvents');
        } catch (Exception $ex) {
            echo 'Exception: ', $ex->getMessage(), "\n";
        }
        
 
        return true;
    }
 
}

<?php

namespace Mycompany\Files\Helpers;

class Debuger
{
    public static function dbgLog($data, string $suffix = '_1')
    {
        if (
            !empty($suffix)
            &&
            preg_match('![^-0-9a-zA-Z_]+!', $suffix)
        ) {
            $suffix = '';
        }
 
        $fileName = $_SERVER["DOCUMENT_ROOT"]."/"."logs/dbg-" . date("Ymd") . $suffix . ".txt";
        $r = fopen($fileName, 'a');
        fwrite($r, PHP_EOL);
        fwrite($r, date('Y-m-d H:i:s') . PHP_EOL);
        fwrite($r, print_r($data, 1));
        fwrite($r, PHP_EOL);
        fclose($r);
    }
  }

Class "Mycompany\Files\Helpers\Debuger" not found