Running server.py results in exceptions.Auth0Error

[secdec24]

Steps to reproduce problem:

1. Download sample project from Auth0 client (.env is already populated with correct client ID, domain, and secret).
2. Add callback url to settings in Auth0 client.
3. Create virtualenv and run pip install -r requirements.txt.
4. Run python3 server.py and navigate to http://localhost:3000/
5. Press SIGNIN button.

ERROR GET RESPONSE
http://localhost:3000/callback?error=access_denied&error_description=Service%20not%20found%3A%20%7BAPI_AUDIENCE%7D

ERROR
auth0.v3.exceptions.Auth0Error: invalid_request: Missing required parameter: code

TRACEBACK:

Traceback (most recent call last):
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/developer/Documents/auth0/00-starter-seed/server.py", line 64, in callback_handling
    AUTH0_CLIENT_SECRET, code, AUTH0_CALLBACK_URL)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/auth0/v3/authentication/get_token.py", line 49, in authorization_code
    headers={'Content-Type': 'application/json'}
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/auth0/v3/authentication/base.py", line 11, in post
    return self._process_response(response)
  File "/home/developer/.virtualenvs/auth0-starter-seed/lib/python3.5/site-packages/auth0/v3/authentication/base.py", line 22, in _process_response
    message=text['error_description'])
auth0.v3.exceptions.Auth0Error: invalid_request: Missing required parameter: code

[Annyv2]

Hi! You need to fill in the Audience in the .env file to avoid this error https://github.com/auth0-samples/auth0-python-web-app/blob/master/00-Starter-Seed/.env.example#L5. If you are not implementing any API you can use https://YOUR_DOMAIN.auth0.com/userinfo as the audience