Автозагрузка классов

Класс находиться по пути: App/FabricMethod>Posts.php

    namespace Posts;
/**
 * Класс почта
 * @package Posts
 */
abstract class Posts
{
    abstract public function getPostDelivery(): Delivery;

    public function dispatch ($content): void
    {
        $work = $this->getPostDelivery();
        $work->recd();
        $work->delivered();
    }
}

class AirPost extends Posts
{
    private int $weight;
    private string $to;
    private string $from;

    /**
     * @param $from
     * @param $to
     * @param $weight
     */
    public function __construct(string $from, string $to, int $weight)
    {
        $this->from = $from;
        $this->to = $to;
        $this->weight = $weight;
    }

    public function getPostDelivery(): Delivery
    {
        return new PlaneDelivery($this->from, $this->to, $this->weight);
    }
}

abstract class EarthPost extends Posts
{
    protected int $weight;
    protected string $to;
    protected string $from;

    /**
     * @param $from
     * @param $to
     * @param $weight
     */
    public function __construct(string $from, string $to, int $weight)
    {
        $this->from = $from;
        $this->to = $to;
        $this->weight = $weight;
    }

    abstract public function getPostDelivery(): Delivery;
}

class TrainPost extends EarthPost
{
    public function __construct(string $from, string $to, int $weight)
    {
        parent::__construct($from, $to, $weight);
    }
    public function getPostDelivery(): Delivery
    {
        return new TrainDelivery($this->from, $this->to, $this->weight);
    }
}

class TruckPost extends EarthPost
{
    public function __construct(string $from, string $to, int $weight)
    {
        parent::__construct($from, $to, $weight);
    }
    public function getPostDelivery(): Delivery
    {
        return new TruckDelivery($this->from, $this->to, $this->weight);
    }
}

interface Delivery
{
    public function recd();

    public function delivered();
}

class PlaneDelivery implements Delivery
{
    private int $weight;
    private string $to;
    private string $from;
    private float $cost = 0;

    public function __construct(string $from, string $to, float $weight)
    {
        $this->from = $from;
        $this->to = $to;
        $this->weight = $weight;
        $this->cost = $weight * 12;
    }

    public function recd()
    {
        echo "{$this->from} - посылка принято. Сумма доставки {$this->cost}! Доставка на самолете!";
    }

    public function delivered()
    {
        echo "{$this->to} - доставлено!";
    }
}

class TrainDelivery implements Delivery
{
    private int $weight;
    private string $to;
    private string $from;
    private float $cost = 0;

    public function __construct(string $from, string $to, float $weight)
    {
        $this->from = $from;
        $this->to = $to;
        $this->weight = $weight;
        $this->cost = $weight * 5;
    }

    public function recd()
    {
         echo "{$this->from} - посылка принято. Сумма доставки {$this->cost}! Доставка на самолете!";
    }

    public function delivered()
    {
        echo "{$this->to} - доставлено!";
    }
}

class TruckDelivery implements Delivery
{
    private int $weight;
    private string $to;
    private string $from;
    private int $cost = 0;

    public function __construct(string $from, string $to, int $weight)
    {
        $this->from = $from;
        $this->to = $to;
        $this->weight = $weight;
        $this->cost = $weight * 7;
    }

    public function recd()
    {
         echo "{$this->from} - посылка принято. Сумма доставки {$this->cost}! Доставка на самолете!";
    }

    public function delivered()
    {
        echo "{$this->to} - доставлено! <br>";
    }
}

сделал для нее автозагрзузчик

{
    "autoload": {
        "psr-4": {
            "Posts\\": "App/FabricMethod/"
        }
    }
}

на index.php обращаюсь к классу

require "vendor/autoload.php";

use Posts\Posts;
use Posts\TrainPost;

//require 'App/FabricMethod/Posts.php';

function clientCode(Posts $creator)
{
    $creator->dispatch("Hello world!");
}


echo "Testing ConcreteCreator1: <br>";
clientCode(new TrainPost('Moscow', 'Volgograd', 1));

получаю Fatal error: Uncaught Error: Class 'Posts\TrainPost' not found in /opt/lampp/htdocs/site.loc/index.php

уже 2 дня не понимаю как это сделать. я новичок, помогите пожалуйста! Когда пишу "use"ы phpstorm видит классы и дает подсказки