I got a similar issue.

Saving an instance "put()" of an object with a UserProperty referring
to a users.user that is a federated_identity causes a corruption of
the instance. accessing the object after the put will result in the
following exception:

File "/base/python_runtime/python_lib/versions/1/google/appengine/api/
users.py" in __init__
  104.       raise UserNotFoundError

This is totally weird since I'm not even updating that property.

Sebastien

On Jun 16, 4:10 am, Roberto <[email protected]> wrote:
> Well, I was able to solve it by myself: did a SELECT __key__ query,
> fetched the last entity and deleted it.
>
> My undertanding is that the problem was generated by creating and
> storing a User object created with afederated_identitywith no email
> address (blogger.com, in that specific case).
> The application must verify that this information is passed by the
> federated_provider and if not, ask the user to provide it via a web
> form or do not attempt to store the object.
>
> Thanks
> Roberto
>
> On 16 Giu, 01:05, Roberto <[email protected]> wrote:
>
>
>
> > Sorry for the repost, but I am totally stuck.
> > There is no way of removing the corrupted entity.
> > App Id: test-pappa-mi
> > Entity: Commissario (corrupted entity should be the last created of
> > its kind)
>
> >  this is the stack trace:
> > Traceback (most recent call last):
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > ext/webapp/__init__.py", line 511, in __call__
> >     handler.get(*groups)
> >   File "/base/data/home/apps/test-pappa-mi/1.342696057774496084/py/
> > admin.py", line 419, in get
> >     for commissario in Commissario.all():
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > ext/db/__init__.py", line 1816, in next
> >     return self.__model_class.from_entity(self.__iterator.next())
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > api/datastore.py", line 2082, in next
> >     self.__buffer = self._Next(self.__batch_size)
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > api/datastore.py", line 2028, in _Next
> >     return self._ProcessQueryResult(result)
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > api/datastore.py", line 2058, in _ProcessQueryResult
> >     return [Entity._FromPb(e) for e in result.result_list()]
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > api/datastore.py", line 760, in _FromPb
> >     value = datastore_types.FromPropertyPb(prop)
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > api/datastore_types.py", line 1597, in FromPropertyPb
> >    federated_identity=federated_identity)
> >   File "/base/python_runtime/python_lib/versions/1/google/appengine/
> > api/users.py", line 104, in __init__
> >     raise UserNotFoundError
> > UserNotFoundError
>
> > Thanks
> > Roberto
>
> > On 15 Giu, 12:10, "Nick Johnson (Google)" <[email protected]>
> > wrote:
>
> > > Hi Roberto,
>
> > > What is your App ID?
>
> > > -Nick Johnson
>
> > > On Tue, Jun 15, 2010 at 11:04 AM, Roberto 
> > > <[email protected]>wrote:
>
> > > > Hi all,
>
> > > > I have a serious problem with an application using OpenId
> > > > autentication.
>
> > > > I tested the app using using blogger.com as an openid provider and
> > > > stored the User object in the Datastore, in a UserProfile table.
> > > > Now it is not possible to retrieve the entity containing that User,
> > > > raising UserNotFoundError.
>
> > > > Even the remote Datastore Viewer crashes with the following message
> > > > when querying the entity:
> > > > Server Error
> > > > A server error has occurred.
>
> > > > Any help is appreciated.
>
> > > > Thanks
> > > > Roberto
>
> > > > --
> > > > You received this message because you are subscribed to the Google 
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> > > > "Google App Engine" group.
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> > > >  [email protected]>
> > > > .
> > > > For more options, visit this group at
> > > >http://groups.google.com/group/google-appengine?hl=en.
>
> > > --
> > > Nick Johnson, Developer Programs Engineer, App Engine Google Ireland Ltd. 
> > > ::
> > > Registered in Dublin, Ireland, Registration Number: 368047
> > > Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
> > > 368047

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