The error is: Uncaught Error: Cannot find module 'url' I my only code is:

import sdk from 'matrix-js-sdk';

const client = sdk.createClient("https://matrix.org");
client.login("m.login.password", {"user": "Jak2k", "password": localStorage.getItem("pass")}).then((response) => {
    console.log(response.access_token);
});

Before that, I just installed it with npm.(Maybe it's important, that I use react in the same package.)