在C：\ wamp64 \ www \ html \ index.php中找不到“Spatie \ Browsershot \ Browsershot”类

I'm trying to use browsershot (I'm using WAMP to host my local server) and basically I just try to create an instance of the class Browsershot() and it gives me this error :

Class 'Spatie\Browsershot\Browsershot' not found in C:\wamp64\www\html\index.php

I've tried redownloading both node and browsershot but nothing worked, I'm stuck. (I have a node 10 version and a PHP 7)

<?php 
use Spatie\Browsershot\Browsershot;
$browser = new Browsershot();
?>

Assuming you have the following directory structure:

+ YourApp
    + vendor
        + composer
        + guzzle
        + intervention
        + ...
        - autoload.php
    - composer.json
    - composer.lock
    - index.php

Use following in index.php:

<?php
use Spatie\Browsershot\Browsershot;

require __DIR__ . '/vendor/autoload.php';

$browser = new Browsershot();