Robinhood responded with code 401: unauthorized. { "detail": "Incorrect authentication credentials." }

[alexjavad]

I'm trying to authenticate my Robinhood user programmatically, so I can issue trades programmatically, using the following recommended code:

const myUser = new User(credentials.username, credentials.password, options);

myUser.authenticate()
    .then(() => {
        // User was authenticated
        console.log("Algotrader User Authenticated...");
    })
    .catch(error => {
        console.log("Authentication Error: " + error);
    });

But I'm getting the following error printed to the console when I run the app.js file:

Can anyone shed some light on this issue please? Thanks in advance!