Traceback (most recent call last):
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/ec2-user/environment/ftpwebapp/app.py", line 41, in homePage
    u.authenticate(password)
  File "/usr/local/lib/python2.7/site-packages/warrant/__init__.py", line 382, in authenticate
    tokens = aws.authenticate_user()
  File "/usr/local/lib/python2.7/site-packages/warrant/aws_srp.py", line 206, in authenticate_user
    ClientId=self.client_id
  File "/usr/local/lib/python2.7/site-packages/botocore/client.py", line 314, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/usr/local/lib/python2.7/site-packages/botocore/client.py", line 586, in _make_api_call
    api_params, operation_model, context=request_context)
  File "/usr/local/lib/python2.7/site-packages/botocore/client.py", line 621, in _convert_to_request_dict
    api_params, operation_model)
  File "/usr/local/lib/python2.7/site-packages/botocore/validate.py", line 291, in serialize_to_request
    raise ParamValidationError(report=report.generate_report())
ParamValidationError: Parameter validation failed:
Invalid type for parameter AuthParameters.USERNAME, value: None, type: <type 'NoneType'>, valid types: <type 'basestring'>