I found why i had this error message. I did'nt put environement when i mount my main component.

before, i had this code to mount my component :

owl.whenReady( () => {
    mount(Playground, document.body, { templates, dev: true});
});

But i need to add the environement :

import { mount, useEnv } from "@odoo/owl"; //to import the useEnv

owl.whenReady( () => {
    const env = makeEnv();
    // put things into the env
    mount(Playground, document.body, { templates, dev: true, env });
});

After searching into the odoo code, I found this file :

odoo/addons/web/static/src/legacy/js/public/public_env.js

It contain a default env this all services.

So, my code became :

owl.whenReady( () => {
    const env = require("web.public_env");
    // put things into the env
    mount(Playground, document.body, { templates, dev: true, env });
});

I hope this will help someone,

Regard