Fixed error message in detail generic view.

Thanks go to mitar for the report and the patch.

Author: apollo13

django/views/generic/detail.py

@@ -66,7 +66,7 @@ def get_queryset(self):
  else:
  raise ImproperlyConfigured("%(cls)s is missing a queryset. Define "
  "%(cls)s.model, %(cls)s.queryset, or override "
- "%(cls)s.get_object()." % {
+ "%(cls)s.get_queryset()." % {
  'cls': self.__class__.__name__
  })
  return self.queryset._clone()