Deploy to Heroku button fails

[stock90975]

Hi,

thanks for flask-dance! It's fantastic!

I'm trying out the Deploy to Heroku button, and I get error on deployment

Run scripts & scale dynos
Postdeploy exit code was not 0

Am I missing some step before attempting depolyment with the button?

Thanks!

Traceback (most recent call last):
  File "/app/.heroku/python/bin/flask", line 8, in <module>
    sys.exit(main())
  File "/app/.heroku/python/lib/python3.9/site-packages/flask/cli.py", line 990, in main
    cli.main(args=sys.argv[1:])
  File "/app/.heroku/python/lib/python3.9/site-packages/flask/cli.py", line 596, in main
    return super().main(*args, **kwargs)
  File "/app/.heroku/python/lib/python3.9/site-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/app/.heroku/python/lib/python3.9/site-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/app/.heroku/python/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/app/.heroku/python/lib/python3.9/site-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/app/.heroku/python/lib/python3.9/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/app/.heroku/python/lib/python3.9/site-packages/flask/cli.py", line 440, in decorator
    return __ctx.invoke(f, *args, **kwargs)
  File "/app/.heroku/python/lib/python3.9/site-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/app/app/cli.py", line 9, in create_db
    db.create_all()
  File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/__init__.py", line 1094, in create_all
    self._execute_for_all_tables(app, bind, 'create_all')
  File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/__init__.py", line 1086, in _execute_for_all_tables
    op(bind=self.get_engine(app, bind), **extra)
  File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/__init__.py", line 1017, in get_engine
    return connector.get_engine()
  File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/__init__.py", line 594, in get_engine
    self._engine = rv = self._sa.create_engine(sa_url, options)
  File "/app/.heroku/python/lib/python3.9/site-packages/flask_sqlalchemy/__init__.py", line 1027, in create_engine
    return sqlalchemy.create_engine(sa_url, **engine_opts)
  File "<string>", line 2, in create_engine
  File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/util/deprecations.py", line 298, in warned
    return fn(*args, **kwargs)
  File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/engine/create.py", line 522, in create_engine
    entrypoint = u._get_entrypoint()
  File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/engine/url.py", line 636, in _get_entrypoint
    cls = registry.load(name)
  File "/app/.heroku/python/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 343, in load
    raise exc.NoSuchModuleError(
sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgres