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.