NotAllowedError using users.create_login_url

[Stuart Cameron]

I am having trouble with a very basic example using `users.create_login_url` based on the example code in the [How-to guide](https://cloud.google.com/appengine/docs/python/users/). The example works fine in the local development server but not when deployed to appspot.com.

import webapp2
import urllib2
from google.appengine.api import users
 
class Main(webapp2.RequestHandler):
    def get(self):
        login_url = users.create_login_url('/')
        self.response.write(login_url)
   
app = webapp2.WSGIApplication([
        ('/', 'Main'),
], debug=True)

Questions such as [this one on StackOverflow](http://stackoverflow.com/questions/19676367/notallowederror-on-front-main-page) suggest the problem is using Google Apps domain instead of Google Accounts API, which I think refers to the setting pictured below. Altering these settings has not fixed the problem.

What is likely to be causing this?

  

[Adam (Cloud Platform Support)]

The first error I'd expect you to get would be "import_string() failed for 'Main'", because the tuple passed to webapp2.WSGIApplication() should include a class, not a string. Changing ('/', 'Main') to ('/', Main) otherwise causes the above code to work fine for me. I'm just using the following simple app.yaml:

runtime: python27
api_version: 1
threadsafe: true

handlers:
- url: /.*
  script: main.app

Have you tried deploying to a new project?