Traceback (most recent call last):


 "C:\Users\adnan\AppData\Local\Programs\Python\Python38-32\lib\site-packages\tornado\ioloop.py", line 907, in _run

return self.callback()


 "C:\Users\adnan\AppData\Local\Programs\Python\Python38-32\lib\site-packages\distributed\nanny.py", line 414, in memory_monitor

process = self.process.process
AttributeError: 'NoneType' object has no attribute 'process'

Traceback (most recent call last):


 "/home/kosc/.local/lib64/python3.5/site-packages/django/core/handlers/exception.py", line 42, in inner

response = get_response(request)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response

response = self.process_exception_by_middleware(e, request)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response

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


 "/home/kosc/.local/lib64/python3.5/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view

return view_func(request, *args, **kwargs)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/views/generic/base.py", line 68, in view

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


 "/home/kosc/.local/lib64/python3.5/site-packages/oscar/apps/dashboard/catalogue/views.py", line 206, in dispatch

request, *args, **kwargs)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/views/generic/base.py", line 88, in dispatch

return handler(request, *args, **kwargs)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/views/generic/edit.py", line 236, in get

return super(BaseUpdateView, self).get(request, *args, **kwargs)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/views/generic/edit.py", line 174, in get

return self.render_to_response(self.get_context_data())


 "/home/kosc/.local/lib64/python3.5/site-packages/oscar/apps/dashboard/catalogue/views.py", line 261, in get_context_data

ctx = super(ProductCreateUpdateView, self).get_context_data(**kwargs)


 "/home/kosc/.local/lib64/python3.5/site-packages/django/views/generic/edit.py", line 93, in get_context_data

kwargs['form'] = self.get_form()


 "/home/kosc/.local/lib64/python3.5/site-packages/django/views/generic/edit.py", line 45, in get_form

return form_class(**self.get_form_kwargs())


 "/home/kosc/.local/lib64/python3.5/site-packages/oscar/apps/dashboard/catalogue/forms.py", line 264, in __init__

self.add_attribute_fields(product_class, self.instance.is_parent)


 "/home/kosc/.local/lib64/python3.5/site-packages/oscar/apps/dashboard/catalogue/forms.py", line 305, in add_attribute_fields

field = self.get_attribute_field(attribute)


 "/home/kosc/.local/lib64/python3.5/site-packages/oscar/apps/dashboard/catalogue/forms.py", line 316, in get_attribute_field

return self.FIELD_FACTORIES[attribute.type](attribute)


 "/home/kosc/.local/lib64/python3.5/site-packages/oscar/apps/dashboard/catalogue/forms.py", line 192, in _attr_option_field

queryset=attribute.option_group.options.all())
AttributeError: 'NoneType' object has no attribute 'options'
