GAE SDKで、module 'PIL' not loadedエラー

　GoogleAppEngineで、こんなエラーが出た。

ERROR    2010-06-08 10:50:55,015 dev_appserver.py:3237] Exception encountered handling request

Traceback (most recent call last):

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3197, in _HandleRequest

    self._Dispatch(dispatcher, self.rfile, outfile, env_dict)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3140, in _Dispatch

    base_env_dict=env_dict)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 522, in Dispatch

    base_env_dict=base_env_dict)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2399, in Dispatch

    self._module_dict)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2309, in ExecuteCGI

    reset_modules = exec_script(handler_path, cgi_path, hook)

  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2205, in ExecuteOrImportScript

    exec module_code in script_module.__dict__

  File "C:\Documents and Settings\kabuki\My Documents\GAE\poseritem\get_renderosity.py", line 110, in <module>

    main()

  File "C:\Documents and Settings\kabuki\My Documents\GAE\poseritem\get_renderosity.py", line 91, in main

    freestuff.img = images.resize(img,width=120)

  File "C:\Program Files\Google\google_appengine\google\appengine\api\images\__init__.py", line 625, in resize

    return image.execute_transforms(output_encoding=output_encoding)

  File "C:\Program Files\Google\google_appengine\google\appengine\api\images\__init__.py", line 513, in execute_transforms

    response)

  File "C:\Program Files\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 78, in MakeSyncCall

    return apiproxy.MakeSyncCall(service, call, request, response)

  File "C:\Program Files\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 278, in MakeSyncCall

    rpc.CheckSuccess()

  File "C:\Program Files\Google\google_appengine\google\appengine\api\apiproxy_rpc.py", line 149, in _WaitImpl

    self.request, self.response)

  File "C:\Program Files\Google\google_appengine\google\appengine\api\apiproxy_stub.py", line 80, in MakeSyncCall

    method(request, response)

  File "C:\Program Files\Google\google_appengine\google\appengine\api\images\images_stub.py", line 193, in _Dynamic_Transform

    response_value = self._EncodeImage(new_image, request.output())

  File "C:\Program Files\Google\google_appengine\google\appengine\api\images\images_stub.py", line 215, in _EncodeImage

    image.save(image_string, image_encoding)

  File "C:\Python25\lib\PIL\Image.py", line 1439, in save

    save_handler(self, fp, filename)

  File "C:\Python25\lib\PIL\PngImagePlugin.py", line 564, in _save

    import ICCProfile

SystemError: Parent module 'PIL' not loaded

INFO     2010-06-08 10:50:55,030 dev_appserver.py:3266] "GET /tasks/renderosity/ HTTP/1.1" 500 -

　ちなみにエラーが発生したpythonコードはコレ。
            freestuff.img = images.resize(img,width=120)
　あちこち見ていると、SDKでのみ起こる現象っぽいがよくわからない。なにかわかったときのために、メモとして問題を残しておくことにしよう。
参考）Trouble using PIL with Google Appengine SDK - Stack Overflow