Fatal error: Class 'Nylas' not found in C:\xampp\htdocs\nylas-php\index.php on line 5

[stplsiraj]

I'm getting the above error while I have already used Nylas, class Nylas not found.
Anybody can help me with this?

my code is:

`<?php
namespace Nylas;

use Nylas;

$client = new Nylas(***, ***);
$redirect_url = 'http://localhost/nylas-php/login_callback.php';
$get_auth_url = $client->createAuthURL($redirect_url);

// redirect to Nylas auth server
header("Location: ".$get_auth_url);
?>`

My folder structure is: