save() got an unexpected keyword argument 'force_insert'

Hi guys,
Anybody knows why I'm at this stage ?
Group.objects.using('db2').get_or_create(name='Maintenance Admin')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 383, in get_or_create
    obj.save(force_insert=True, using=self.db)
TypeError: save() got an unexpected keyword argument 'force_insert'


I'm getting this error on creating a new group on mydatabase2
Not getting the exact reason behind this ...
plz help ...

Thanks in Advance

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