Internal Server Error: /api/tracker/tickets/
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 "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/viewsets.py", line 87, in view
    return self.dispatch(request, *args, **kwargs)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/views.py", line 466, in dispatch
    response = self.handle_exception(exc)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/views.py", line 463, in dispatch
    response = handler(request, *args, **kwargs)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/mixins.py", line 48, in list
    return Response(serializer.data)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/serializers.py", line 674, in data
    ret = super(ListSerializer, self).data
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/serializers.py", line 239, in data
    self._data = self.to_representation(self.instance)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/serializers.py", line 614, in to_representation
    self.child.to_representation(item) for item in iterable
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/serializers.py", line 472, in to_representation
    ret[field.field_name] = field.to_representation(attribute)
  File "/var/www/tracker.wikimedia.cz/deploy/pyenv/lib/python2.7/site-packages/rest_framework/relations.py", line 366, in to_representation
    raise ImproperlyConfigured(msg % self.view_name)
ImproperlyConfigured: Could not resolve URL for hyperlinked relationship using view name "cluster-detail". You may have failed to include the related model in your API, or incorrectly configured the `lookup_field` attribute on this field.