PHP Fatal error: Uncaught Error: Class when using exec(); - php

I'm writing a web app, and I created a scraper to get data from my own site.
I have a few dependencies, so they're being extended, but now that I'm trying to run this php script from exec, and it doesn't work, I get the error:
PHP Fatal error: Uncaught Error: Class 'App\Helpers\ScraperHelper' not found in /home/username/public_html/App/Libraries/Scraper/execute.php:6.
Begin.php
This is how I'm calling my script:
exec('/usr/bin/php/ home/username/public_htm/App/Libraries/Scraper/execute.php');
Execute.php
namespace App\Libraries\Scraper;
use \App\Helpers\ScraperHelper;
$recipe = new ScraperHelper();
$recipe->fromFeed();
fromFeed() runs the script that's included in the ScraperHelper class, scrape the information from the site and inserts it into the database.
I've tried removing all the namespaces, and using require with full server path, but there are a 4 other dependencies that doesn't allow me to access them.
require_once '/home/username/public_html/App/Helpers/ScraperHelper.php';
require_once '/home/username/public_html/App/Models/Food.php';
require_once '/home/username/public_html/Core/Model.php';
Composer is autoloading two folders. Core and App, but I figure that the exec function ignores it which is why I keep getting Uncaught Error.
I believe exec isn't being able to process the namespaces and use calls, I included all the files with require_once and it worked, but It's not what I need still, I really need to know how to make exec process namespaces, use calls.

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