I'm getting a BrowserStateError for some reason

tests.py

import unittest
from flask import Flask, render_template
from flaskext.testing import TestCase, Twill

TWILL_ENABLED = True
DEBUG = True
SECRET_KEY = 'secret'

def create_app():
    app = Flask(__name__)
    app.config.from_object(__name__)
    
    @app.route('/')
    def home():
        return render_template('login.html')
    
    return app


class TestViews(TestCase, Twill):

    def create_app(self):
        app = create_app()
        self.twill = Twill(app)
        return app

    def test_manually(self):
        self.twill.browser.go(self.twill.url("/"))

if __name__ == '__main__':
    unittest.main()