Traceback (most recent call last):


 "/home/bastian/.local/lib/python3.8/site-packages/distributed/batched.py", line 93, in _background_send

nbytes = yield self.comm.write(


 "/home/bastian/.local/lib/python3.8/site-packages/tornado/gen.py", line 762, in run

value = future.result()


 "/home/bastian/.local/lib/python3.8/site-packages/distributed/comm/tcp.py", line 230, in write

frames = await to_frames(


 "/home/bastian/.local/lib/python3.8/site-packages/distributed/comm/utils.py", line 52, in to_frames

return _to_frames()


 "/home/bastian/.local/lib/python3.8/site-packages/distributed/comm/utils.py", line 32, in _to_frames

protocol.dumps(


 "/home/bastian/.local/lib/python3.8/site-packages/distributed/protocol/core.py", line 39, in dumps

small_header, small_payload = dumps_msgpack(msg, **compress_opts)


 "/home/bastian/.local/lib/python3.8/site-packages/distributed/protocol/core.py", line 184, in dumps_msgpack

payload = msgpack.dumps(msg, default=msgpack_encode_default, use_bin_type=True)


 "/home/bastian/.local/lib/python3.8/site-packages/msgpack/__init__.py", line 35, in packb

return Packer(**kwargs).pack(o)


 "msgpack/_packer.pyx", line 292, in msgpack._cmsgpack.Packer.pack


 "msgpack/_packer.pyx", line 298, in msgpack._cmsgpack.Packer.pack


 "msgpack/_packer.pyx", line 295, in msgpack._cmsgpack.Packer.pack


 "msgpack/_packer.pyx", line 264, in msgpack._cmsgpack.Packer._pack


 "msgpack/_packer.pyx", line 231, in msgpack._cmsgpack.Packer._pack


 "msgpack/_packer.pyx", line 231, in msgpack._cmsgpack.Packer._pack


 "msgpack/_packer.pyx", line 229, in msgpack._cmsgpack.Packer._pack


 "msgpack/_packer.pyx", line 264, in msgpack._cmsgpack.Packer._pack


 "msgpack/_packer.pyx", line 289, in msgpack._cmsgpack.Packer._pack
TypeError: can not serialize 'Delayed' object

Traceback (most recent call last):


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__

return self.wsgi_app(environ, start_response)


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app

response = self.handle_exception(e)


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception

reraise(exc_type, exc_value, tb)


 "/opt/py3-superset/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise

raise value


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app

response = self.full_dispatch_request()


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request

rv = self.handle_user_exception(e)


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception

reraise(exc_type, exc_value, tb)


 "/opt/py3-superset/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise

raise value


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request

rv = self.dispatch_request()


 "/opt/py3-superset/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request

return self.view_functions[rule.endpoint](**req.view_args)


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/security/decorators.py", line 26, in wraps

return f(self, *args, **kwargs)


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/views.py", line 478, in list

widgets=widgets)


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/baseviews.py", line 161, in render_template

return render_template(template, **dict(list(kwargs.items()) + list(self.extra_args.items())))


 "/opt/py3-superset/lib/python3.6/site-packages/flask/templating.py", line 134, in render_template

context, ctx.app)


 "/opt/py3-superset/lib/python3.6/site-packages/flask/templating.py", line 116, in _render

rv = template.render(context)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render

return original_render(self, *args, **kwargs)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render

return self.environment.handle_exception(exc_info, True)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception

reraise(exc_type, exc_value, tb)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise

raise value.with_traceback(tb)


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/appbuilder/general/model/list.html", line 2, in top-level template code

{% import 'appbuilder/general/lib.html' as lib %}


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/base.html", line 1, in top-level template code

{% extends base_template %}


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/superset/base.html", line 1, in top-level template code

{% extends "appbuilder/baselayout.html" %}


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/appbuilder/baselayout.html", line 2, in top-level template code

{% import 'appbuilder/baselib.html' as baselib %}


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/init.html", line 46, in top-level template code

{% block body %}


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/appbuilder/baselayout.html", line 21, in block "body"

{% block content %}


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/appbuilder/general/model/list.html", line 12, in block "content"

{% block list_list scoped %}


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/appbuilder/general/model/list.html", line 13, in block "list_list"

{{ widgets.get('list')()|safe }}


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/widgets.py", line 34, in __call__

return template.render(args)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render

return original_render(self, *args, **kwargs)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render

return self.environment.handle_exception(exc_info, True)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception

reraise(exc_type, exc_value, tb)


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise

raise value.with_traceback(tb)


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/superset/fab_overrides/list.html", line 1, in top-level template code

{% extends 'appbuilder/general/widgets/list.html' %}


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/general/widgets/list.html", line 2, in top-level template code

{% extends 'appbuilder/general/widgets/base_list.html' %}


 "/opt/py3-superset/lib/python3.6/site-packages/superset/templates/appbuilder/general/widgets/base_list.html", line 25, in top-level template code

{% block begin_loop_values %}


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/templates/appbuilder/general/widgets/list.html", line 45, in block "begin_loop_values"

{% for item in value_columns %}


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/runtime.py", line 435, in __init__

self._after = self._safe_next()


 "/opt/py3-superset/lib/python3.6/site-packages/jinja2/runtime.py", line 455, in _safe_next

return next(self._iterator)


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/models/base.py", line 114, in get_values

retdict[col] = self._get_attr_value(item, col)


 "/opt/py3-superset/lib/python3.6/site-packages/flask_appbuilder/models/base.py", line 66, in _get_attr_value

return getattr(item, col)()


 "/opt/py3-superset/lib/python3.6/site-packages/superset/models/core.py", line 181, in datasource_link

return datasource.link if datasource else None


 "/opt/py3-superset/lib/python3.6/site-packages/superset/connectors/druid/models.py", line 532, in link

return Markup('<a href="{self.url}">{name}</a>').format(**locals())
TypeError: format() got multiple values for argument 'self'
