Traceback (most recent call last):


 "/Users/igortkachenko/Tools/kivy-designer/venv/lib/python3.6/site-packages/kivy/uix/widget.py", line 265, in _widget_destructor


 "/Users/igortkachenko/Tools/kivy-designer/venv/lib/python3.6/site-packages/kivy/lang/builder.py", line 760, in unbind_widget


 "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'weakref' object has no attribute 'cline_in_traceback'

Traceback (most recent call last):


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner

response = get_response(request)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response

response = self.process_exception_by_middleware(e, request)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response

response = wrapped_callback(request, *callback_args, **callback_kwargs)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view

return view_func(*args, **kwargs)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/django/views/generic/base.py", line 68, in view

return self.dispatch(request, *args, **kwargs)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/views.py", line 483, in dispatch

response = self.handle_exception(exc)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/views.py", line 443, in handle_exception

self.raise_uncaught_exception(exc)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/views.py", line 480, in dispatch

response = handler(request, *args, **kwargs)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/generics.py", line 201, in get

return self.list(request, *args, **kwargs)


 "/Users/iridium/allMoonCloud/api/api/evaluation_rules/views/EvaluationRulesList.py", line 88, in list

data = serializer.data


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 765, in data

ret = super(ListSerializer, self).data


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 262, in data

self._data = self.to_representation(self.instance)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 683, in to_representation

self.child.to_representation(item) for item in iterable


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_framework/serializers.py", line 683, in <listcomp>

self.child.to_representation(item) for item in iterable


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/rest_marshmallow/__init__.py", line 34, in to_representation

return self.dump(instance)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/marshmallow/schema.py", line 454, in dump

index_errors=self.opts.index_errors,


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/marshmallow/marshalling.py", line 148, in serialize

index=(index if index_errors else None),


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/marshmallow/marshalling.py", line 79, in call_and_store

value = getter_func(data)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/marshmallow/marshalling.py", line 143, in <lambda>

getter = lambda d: field_obj.serialize(attr_name, d, accessor=accessor)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/marshmallow/fields.py", line 263, in serialize

return self._serialize(value, attr, obj)


 "/Users/iridium/allMoonCloud/api/env/lib/python3.6/site-packages/marshmallow/fields.py", line 456, in _serialize

schema._update_fields(obj=nested_obj, many=self.many)
AttributeError: 'ListSerializer' object has no attribute '_update_fields'
