Cannot use Premade Instance of loader in PIXI.JS

[Territhekobold]

So I am trying to learn more about PIXI.JS, and I have to set up an loader. I can either create my own, or I can use a premade instance that is called "shared". However when I use it I get an error message that says "Cannot read properties of undefined (reading 'shared')". What am I doing wrong?

const Application = PIXI.Application;
const app = new Application({
    width: 500,
    height: 500,
});

const loader = PIXI.Loader.shared;
loader.add('char4Texture', '/images/2.png');
loader.load(setup);`

function setup(loader, resources) {
    const char4Sprite = new PIXI.Sprite(
        resources.char4Texture
    );
    char4Sprite.y = 400;
};

I have tried to create a loader from scratch, but then I got a whole different error.

Expected outcome: Picture have been added

Actual outcome: Uncaught TypeError: Cannot read properties of undefined (reading 'shared')