Traceback (most recent call last):
  File "run.py", line 1, in <module>
    from blog import app
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskblog__init__.py", line 4, in <module>
    graph.schema.create_uniqueness_constraint("User", "username")
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskvenvlibsite-packagespy2neodatabase__init__.py", line 775, in create_uniqueness_constraint
    {"property_keys": [property_key]})
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskvenvlibsite-packagespy2neodatabasehttp.py", line 212, in post
    raise_from(GraphError(message, **content), error)
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskvenvlibsite-packagespy2neoutil.py", line 124, in raise_from
    raise exception
py2neo.database.status.ConstraintViolationException: Constraint already exists: CONSTRAINT ON ( user:User ) ASSERT user.username IS UNIQUE

Traceback (most recent call last):
  File "run.py", line 1, in <module>
    from blog import app
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskblog__init__.py", line 1, in <module>
    from .views import app
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskblogviews.py", line 1, in <module>
    from .models import User, get_todays_recent_posts
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskblogmodels.py", line 11, in <module>
    graph = Graph(url + '/db/data/', username=username, password=password)
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskvenvlibsite-packagespy2neodatabase__init__.py", line 327, in __new__
    use_bolt = version_tuple(inst.__remote__.get().content["neo4j_version"]) >= (3,)
  File "C:UsersAdministratorDownloadspy2neoneo4j-flaskvenvlibsite-packagespy2neodatabasehttp.py", line 157, in get
    raise Unauthorized(self.uri.string)
py2neo.database.status.Unauthorized: http://localhost:7474/db/data/