Internal Server Error: /users/
Traceback (most recent call last):
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "./tracker/views.py", line 1008, in user_list
    'media': MediaInfo.objects.extra(where=['ticket_id in (select id from tracker_ticket where requested_user_id is null)']).aggregate(objects=models.Count('id'), media=models.Sum('count')),
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/query.py", line 302, in aggregate
    query.add_annotation(aggregate_expr, alias, is_summary=True)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/sql/query.py", line 983, in add_annotation
    summarize=is_summary)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/aggregates.py", line 20, in resolve_expression
    c = super(Aggregate, self).resolve_expression(query, allow_joins, reuse, summarize)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/expressions.py", line 502, in resolve_expression
    c.source_expressions[pos] = arg.resolve_expression(query, allow_joins, reuse, summarize, for_save)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/expressions.py", line 459, in resolve_expression
    return query.resolve_ref(self.name, allow_joins, reuse, summarize)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1533, in resolve_ref
    self.get_initial_alias(), reuse)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1472, in setup_joins
    names, opts, allow_many, fail_on_missing=True)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1397, in names_to_path
    "Choices are: %s" % (name, ", ".join(available)))
FieldError: Cannot resolve keyword 'count' into field. Choices are: canonicaltitle, categories, created, height, id, name, thumb_url, ticket, ticket_id, usages, width