Confusing error message

[brunoreis]

As goszczynskip mentioned on:

#2

if you have a different redirect_url passed to login() than the one on Auth0 config, it will show a message saying "Auth0Client was not initialized" and that's very confusing.

[brunoreis]

This seemed to be happening due to the wrong "Allowed Web Origins". I'm adding it here to facilitate the reproduction, but the message is still very confusing, so I keep the message improvement suggestion.

[sandrinodimattia]

All of the concepts of this library have been moved to the official Auth0 SDK for React (https://github.com/auth0/auth0-react), so I'll be archiving this repository shortly.