Flask - A blueprint's name collision occurred
It looks like your app is registering the Bootstrap blueprint twice. There is a line in the Bootstrap's source code which does register it in init_app()
Try either removing it from here:
... bootstrap, db, ma, # Warning: Flask-SQLAlchemy must be initialized before Flask-Marshmallow. login_manager,or from this tuple:
# Blueprint List: Wrap up the all blueprints buleprints = ( dict(blueprint=users.users_bp, url_prefix='/users'), dict(blueprint=web_bp, url_prefix=''), )