[google-appengine] about error django 1.2 was requested, but 0.96.4.None is already in use

[saintthor]

i have added such code:
======
from google.appengine.dist import use_library

use_library('django', '1.2')
webapp_django_version = '1.2'
======

but the error raised in use_library()

==========

2011-09-19 00:20:02.722

<class 'google.appengine.dist._library.UnacceptableVersionError'>:
django 1.2 was requested, but 0.96.4.None is already in use
Traceback (most recent call last):
  File "/base/data/home/apps/djdqbbs/d1.353358444069227713/2.py", line
8, in <module>
    from List import ListPg, PostPg, UserPg, InputPg, TreePg,
WithChatPg, TestPg, MinePg, VerifyPage, OldPg, CssPg
  File "/base/data/home/apps/djdqbbs/d1.353358444069227713/List.py",
line 10, in <module>
    from google.appengine.ext.webapp.template import render
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
ext/webapp/template.py", line 66, in <module>
    webapp._config_handle.django_setup()
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
api/lib_config.py", line 352, in __getattr__
    self._update_configs()
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
api/lib_config.py", line 289, in _update_configs
    self._registry.initialize()
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
api/lib_config.py", line 164, in initialize
    import_func(self._modname)
  File "/base/data/home/apps/djdqbbs/d1.353358444069227713/
appengine_config.py", line 41, in <module>
    use_library('django', '1.2')
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
dist/_library.py", line 414, in use_library
    InstallLibrary(name, version, explicit=True)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
dist/_library.py", line 367, in InstallLibrary
    CheckInstalledVersion(name, version, explicit=True)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/
dist/_library.py", line 300, in CheckInstalledVersion
    (name, desired_version, installed_version))

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