Unicode Error in Admin

gistfile1.txt

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py", line 583, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py", line 105, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/cache.py", line 52, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/sites.py", line 206, in inner
    return view(request, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py", line 29, in _wrapper
    return bound_func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py", line 105, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/decorators.py", line 25, in bound_func
    return func.__get__(self, type(self))(*args2, **kwargs2)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py", line 1511, in changelist_view
    response = self.response_action(request, queryset=cl.get_queryset(request))
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/options.py", line 1282, in response_action
    response = func(self, request, queryset)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/actions.py", line 37, in delete_selected
    queryset, opts, request.user, modeladmin.admin_site, using)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/utils.py", line 153, in get_deleted_objects
    to_delete = collector.nested(format_callback)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/utils.py", line 211, in nested
    roots.extend(self._nested(root, seen, format_callback))
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/utils.py", line 194, in _nested
    children.extend(self._nested(child, seen, format_callback))
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/utils.py", line 194, in _nested
    children.extend(self._nested(child, seen, format_callback))
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/utils.py", line 196, in _nested
    ret = [format_callback(obj)]
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/admin/utils.py", line 126, in format_callback
    force_text(obj))
  File "/usr/local/lib/python2.7/dist-packages/django/utils/encoding.py", line 87, in force_text
    s = six.text_type(bytes(s), encoding, errors)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xed' in position 7: ordinal not in range(128)
[26/Feb/2015 17:48:30] "POST /en/admin/course/cohort/ HTTP/1.1" 500 282308