Full tranceback

(venv) deadsec@deadsec:~/Desktop/Ruby[WebSite]$ flask fab create-user
Role [Public]:
Username: Elgon2003
User first name: Antonio
User last name: Goncalves
Email: amng*****@gmail.com
Password:
Repeat for confirmation:
/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/flask_sqlalchemy/__init__.py:834: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
  warnings.warn(FSADeprecationWarning(
Traceback (most recent call last):
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/bin/flask", line 8, in <module>
    sys.exit(main())
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/flask/cli.py", line 966, in main
    cli.main(prog_name="python -m flask" if as_module else None)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/flask/cli.py", line 586, in main
    return super(FlaskGroup, self).main(*args, **kwargs)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/flask/cli.py", line 426, in decorator
    return __ctx.invoke(f, *args, **kwargs)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/flask_appbuilder/cli.py", line 88, in create_user
    role_object = current_app.appbuilder.sm.find_role(role)
  File "/home/deadsec/Desktop/Ruby[WebSite]/venv/lib/python3.8/site-packages/werkzeug/local.py", line 347, in __getattr__
    return getattr(self._get_current_object(), name)
AttributeError: 'Flask' object has no attribute 'appbuilder'