scheduler error

[HY Peng]

run web2py with uwsgi and python3.6.

Traceback (most recent call last):

  File "/home/www-data/web2py2000/gluon/restricted.py", line 219, in restricted

    exec(ccode, environment)

  File "applications/sai_admin/models/menu.py", line 49, in <module>

    menus = menu_service.get_menu_config()

  File "/home/www-data/web2py2000/applications/sai_admin/modules/system_menu.py", line 94, in get_menu_config

    menus = db(query).select(orderby=db.kc_menu.order_id)

  File "/home/www-data/web2py2000/gluon/packages/dal/pydal/objects.py", line 2395, in select

    return adapter.select(self.query, fields, attributes)

  File "/home/www-data/web2py2000/gluon/packages/dal/pydal/adapters/base.py", line 763, in select

    return self._select_aux(sql, fields, attributes, colnames)

  File "/home/www-data/web2py2000/gluon/packages/dal/pydal/adapters/base.py", line 719, in _select_aux

    rows = self._select_aux_execute(sql)

  File "/home/www-data/web2py2000/gluon/packages/dal/pydal/adapters/base.py", line 713, in _select_aux_execute

    self.execute(sql)

  File "/home/www-data/web2py2000/gluon/packages/dal/pydal/adapters/__init__.py", line 63, in wrap

    if not args[0].connection:

  File "/home/www-data/web2py2000/gluon/packages/dal/pydal/connection.py", line 38, in connection

    return getattr(THREAD_LOCAL, self._connection_uname_)

AttributeError: '_thread._local' object has no attribute '_pydal_connection_140633843644848_18476'

what's the problem?