Sphinx autodoc TypeError: объект типа не повторяется

При попытке создать документацию (любого типа: html, man-страницы, latexpdf ...) sphinx завершается ошибкой при попытке автодокументировать подкаталог проекта. Я пробовал много разных подходов, чтобы попытаться сузить круг проблем, но, похоже, не могу найти виновника. Все первые файлы были созданы sphinx-apidoc.

В каталоге A есть следующий первый файл:

Directory A
=======================================

Submodules
----------

.. toctree::

   A.fileB
   A.fileC
   A.fileD
   A.fileE

Module contents
---------------

.. automodule:: A
    :members:
    :undoc-members:
    :show-inheritance:

Сбой не происходит, если директива: members: удалена. Сбой также не возникает, если файлы B или E отсутствуют, или если импорт файла B в E отсутствует или закомментирован.

Он все равно не сработает, если соединить fileB и fileE просто следующим образом:

fileB:

class B(object):
    pass

fileE:

from fileB import B

class E(B):
    pass

со следующей трассировкой стека:

# Sphinx version: 1.3b2
# Python version: 2.7.5
# Docutils version: 0.12 release
# Jinja2 version: 2.6
# Last messages:
#   reading sources... [ 37%] foo
#   reading sources... [ 37%] foo
#   reading sources... [ 38%] foo
#   reading sources... [ 38%] foo
#   reading sources... [ 39%] foo
#   reading sources... [ 39%] foo
#   reading sources... [ 40%] foo
#   reading sources... [ 40%] foo
#   reading sources... [ 41%] foo
#   reading sources... [ 41%] problem file
# Loaded extensions:
#   sphinx.ext.autodoc (1.3b2) from Sphinx-1.3b2-py2.7.egg/sphinx/ext/autodoc.pyc
#   sphinx.ext.viewcode (1.3b2) from Sphinx-1.3b2-py2.7.egg/sphinx/ext/viewcode.pyc
Traceback (most recent call last):
  File "Sphinx-1.3b2-py2.7.egg/sphinx/cmdline.py", line 246, in main
    app.build(opts.force_all, filenames)
  File "Sphinx-1.3b2-py2.7.egg/sphinx/application.py", line 257, in build
    self.builder.build_update()
  File "Sphinx-1.3b2-py2.7.egg/sphinx/builders/__init__.py", line 237, in build_update
    'out of date' % len(to_build))
  File "Sphinx-1.3b2-py2.7.egg/sphinx/builders/__init__.py", line 251, in build
    self.doctreedir, self.app))
  File "Sphinx-1.3b2-py2.7.egg/sphinx/environment.py", line 585, in update
    self._read_serial(docnames, app)
  File "Sphinx-1.3b2-py2.7.egg/sphinx/environment.py", line 601, in _read_serial
    self.read_doc(docname, app)
  File "Sphinx-1.3b2-py2.7.egg/sphinx/environment.py", line 753, in read_doc
    pub.publish()
  File "docutils/core.py", line 217, in publish
    self.settings)
  File "docutils/readers/__init__.py", line 72, in read
    self.parse()
  File "docutils/readers/__init__.py", line 78, in parse
    self.parser.parse(self.input, document)
  File "docutils/parsers/rst/__init__.py", line 172, in parse
    self.statemachine.run(inputlines, document, inliner=self.inliner)
  File "docutils/parsers/rst/states.py", line 170, in run
    input_source=document['source'])
  File "docutils/statemachine.py", line 239, in run
    context, state, transitions)
  File "docutils/statemachine.py", line 460, in check_line
    return method(match, context, next_state)
  File "docutils/parsers/rst/states.py", line 2726, in underline
    self.section(title, source, style, lineno - 1, messages)
  File "docutils/parsers/rst/states.py", line 327, in section
    self.new_subsection(title, lineno, messages)
  File "docutils/parsers/rst/states.py", line 395, in new_subsection
    node=section_node, match_titles=True)
  File "docutils/parsers/rst/states.py", line 282, in nested_parse
    node=node, match_titles=match_titles)
  File "docutils/parsers/rst/states.py", line 195, in run
    results = StateMachineWS.run(self, input_lines, input_offset)
  File "docutils/statemachine.py", line 239, in run
    context, state, transitions)
  File "docutils/statemachine.py", line 460, in check_line
    return method(match, context, next_state)
  File "docutils/parsers/rst/states.py", line 2726, in underline
    self.section(title, source, style, lineno - 1, messages)
  File "docutils/parsers/rst/states.py", line 327, in section
    self.new_subsection(title, lineno, messages)
  File "docutils/parsers/rst/states.py", line 395, in new_subsection
    node=section_node, match_titles=True)
  File "docutils/parsers/rst/states.py", line 282, in nested_parse
    node=node, match_titles=match_titles)
  File "docutils/parsers/rst/states.py", line 195, in run
    results = StateMachineWS.run(self, input_lines, input_offset)
  File "docutils/statemachine.py", line 239, in run
    context, state, transitions)
  File "docutils/statemachine.py", line 460, in check_line
    return method(match, context, next_state)
  File "docutils/parsers/rst/states.py", line 2299, in explicit_markup
    nodelist, blank_finish = self.explicit_construct(match)
  File "docutils/parsers/rst/states.py", line 2311, in explicit_construct
    return method(self, expmatch)
  File "docutils/parsers/rst/states.py", line 2054, in directive
    directive_class, match, type_name, option_presets)
  File "docutils/parsers/rst/states.py", line 2103, in run_directive
    result = directive_instance.run()
  File "Sphinx-1.3b2-py2.7.egg/sphinx/ext/autodoc.py", line 1441, in run
    documenter.generate(more_content=self.content)
  File "Sphinx-1.3b2-py2.7.egg/sphinx/ext/autodoc.py", line 816, in generate
    self.document_members(all_members)
  File "Sphinx-1.3b2-py2.7.egg/sphinx/ext/autodoc.py", line 699, in document_members
    members_check_module, members = self.get_object_members(want_all)
  File "Sphinx-1.3b2-py2.7.egg/sphinx/ext/autodoc.py", line 878, in get_object_members
    for mname in memberlist:
TypeError: 'type' object is not iterable

Что-то не так с файлами, которые пытается прочитать autodoc, или это проблема самого autodoc? есть ли какая-то работа, которую я могу попробовать?

Спасибо!