I am getting attribute error! NoneType!

[shahandgithub]

I have no clue what is going on! but first my localhost:5000 was not found. I tried another time and now it is up with showing Builtins.Attribute.Errors

And I am getting many of these things below on my machine:

• Serving Flask app "app/app.py" (lazy loading)
• Environment: development
• Debug mode: on
• Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
• Restarting with stat
• Debugger is active!
• Debugger PIN: 167-677-124
  127.0.0.1 - - [28/Dec/2020 17:32:39] "GET / HTTP/1.1" 500 -
  Traceback (most recent call last):
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
  raise value
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask/cli.py", line 76, in find_best_app
  app = call_factory(script_info, app_factory)
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask/cli.py", line 116, in call_factory
  return app_factory()
  File "/Users/shahand/mlh-hackathon-flask-starter/app/app.py", line 14, in create_app
  register_extensions(app)
  File "/Users/shahand/mlh-hackathon-flask-starter/app/app.py", line 24, in register_extensions
  db.create_all()
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask_sqlalchemy/init.py", line 963, in create_all
  self._execute_for_all_tables(app, bind, 'create_all')
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask_sqlalchemy/init.py", line 955, in _execute_for_all_tables
  op(bind=self.get_engine(app, bind), **extra)
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask_sqlalchemy/init.py", line 896, in get_engine
  return connector.get_engine()
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask_sqlalchemy/init.py", line 556, in get_engine
  self._sa.apply_driver_hacks(self._app, info, options)
  File "/Users/shahand/mlh-hackathon-flask-starter/venv/lib/python3.7/site-packages/flask_sqlalchemy/init.py", line 830, in apply_driver_hacks

Can someone tell me please what I am missing?
Thank you