Confusing About DIRECTORY_SEPARATOR

Hi,

I'm confusing about DIRECTORY_SEPARATOR. I encountered some errors in folder structure during theme usage. Here is my folder structure.

Code:

├───app
├───public
├───system
├───ThirdParty
│   └───Site
│       ├───Config
│       ├───Controllers
│       │   └───Common
│       ├───Database
│       │   ├───Migrations
│       │   └───Seeds
│       ├───Helpers
│       ├───Language
│       ├───Models
│       └───Views
│           └───theme
│               └───jango
│                   ├───assets
│                   └───common
└───writable

When i try to reach my headerView.php codeigniter shows error "Invalid file: Site\Views\theme\jango\common\headerView.php

After some research i found some code blocks under FileLocator  (system/Autoloader/FileLocator.php)

PHP Code:

protected function getNamespaces(string $prefix = null) {
        if ($prefix) {
            $path = $this->autoloader->getNamespace($prefix);

            return isset($path[0])
                ? rtrim($path[0], DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR
                : '';
        }

        $namespaces = [];

        foreach ($this->autoloader->getNamespace() as $prefix => $paths) {
            foreach ($paths as $path) {
                $namespaces[] = [
                    'prefix' => $prefix,
                    'path'   => rtrim($path, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR,
                ];
            }
        }

        return $namespaces;
    } 


when i change

Code:

? rtrim($path[0], DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR
to
? rtrim($path[0], DIRECTORY_SEPARATOR) . '/'

my problem solves. But it's core file. Do i have to change ? 

I'm using Windows 10 and Lastest version of WAMP (3.1.9), PHP 7.3.5


Best Wishes