404 Permission matching query does not exist after migration

[StrangeTrousers]

I recently migrated my working Paperless-ngx 2.7.2 docker stack from a Docker stack on a standalone AMD64 Linux server to my new Synology NAS, still as a docker stack. I did nothing fancy here. I did a clean install of the Paperless-ngx 2.7.2 stack - I use MariaDB. I used "docker compose exec -T webserver document_exporter ../export" and document_importer in the same way on my Synology NAS. It all seemed to work fine. I logged in to Paperless using the same user as before and I can see everything looks ok, but if I try to open/edit a document by double clicking or choosing edit I get 404 error. The log shows:

[2024-04-19 15:32:34,406] [ERROR] [django.request] Internal Server Error: /api/documents/78/
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/asgiref/sync.py", line 518, in thread_handler
    raise exc_info[1]
  File "/usr/local/lib/python3.11/site-packages/django/core/handlers/exception.py", line 42, in inner
    response = await get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/asgiref/sync.py", line 518, in thread_handler
    raise exc_info[1]
  File "/usr/local/lib/python3.11/site-packages/django/core/handlers/base.py", line 253, in _get_response_async
    response = await wrapped_callback(
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/asgiref/sync.py", line 468, in __call__
    ret = await asyncio.shield(exec_coro)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/asgiref/current_thread_executor.py", line 40, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/asgiref/sync.py", line 522, in thread_handler
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/views/decorators/csrf.py", line 56, in wrapper_view
    return view_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/viewsets.py", line 125, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/usr/local/lib/python3.11/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/usr/local/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/mixins.py", line 56, in retrieve
    return Response(serializer.data)
                    ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/serializers.py", line 555, in data
    ret = super().data
          ^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/serializers.py", line 253, in data
    self._data = self.to_representation(self.instance)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/paperless/src/documents/serialisers.py", line 691, in to_representation
    doc = super().to_representation(instance)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/serializers.py", line 522, in to_representation
    ret[field.field_name] = field.to_representation(attribute)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/rest_framework/fields.py", line 1838, in to_representation
    return method(value)
           ^^^^^^^^^^^^^
  File "/usr/src/paperless/src/documents/serialisers.py", line 201, in get_permissions
    "groups": get_groups_with_only_permission(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/paperless/src/documents/permissions.py", line 48, in get_groups_with_only_permission
    permission = Permission.objects.get(content_type=ctype, codename=codename)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/manager.py", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/query.py", line 637, in get
    raise self.model.DoesNotExist(
django.contrib.auth.models.Permission.DoesNotExist: Permission matching query does not exist.

I can "view" any document OK, but I am using an administrator userid.

I saw another report of a similar issue on an older Paperless where the 'consume' userid was the issue, but that userid exists - given I cannot create it, so that is not the issue here.

Any ideas how I can get this back working correctly ?

[StrangeTrousers]

Never mind -- user error. I created a superuser with the same name as a user that existed in the old repository. There were warnings about an existing user on import, but I thought it didn't matter: wrong ! Keep the superuserid separate.
I recreated my stack and re-imported and it's all good now.

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