Before launching the application in debug mode, ensure to edit the login.component.html file and replace the <login-facebook></login-facebook> tag we put there when we implemented the implicit flow with the new component tag:

[...]

<div class="login-link">
    <a [routerLink]="['/register']">
        Don't have an account? Click here to create one!
    </a>
</div>
<login-externalproviders></login-externalproviders>

[...]

It's very important to not keep both of them, as these components perform different--yet intensive--tasks within the page DOM that shouldn't be applied at the same time.