[Python] Python-social-auth login (error in decorator)

I have a problem with Django social auth. I don't know what to do. When I click on ref I get all information from social network (in response if I wrote this argument in function login_vk). In request there is

<QueryDict: {u'state': [u'5v7znP0lBNmp33V2TCOSshU4mQe4MlDn'], u'code': [u'a6acfde533fbd83437'], u'redirect_state': [u'5v7znP0lBNmp12V2TCOSshU4mQe4MlDn']}>


I wrote this code:

from social.apps.django_app.utils import psa
@psa('social:complete')
def login_vk(request, backend):
token = request.GET.get('access_token')
user = request.backend.do_auth(request.GET.get('access_token'))
if user:
login(request, user)
return 'OK'
else:
return 'ERROR'


but I get this error

Exception Value:
'QueryDict' object has no attribute 'session' Exception Location: /usr/local/lib/python2.7/dist-packages/social/strategies/django_strategy.py in init, line 30
​

How can I resolve this problem?

settings.py

INSTALLED_APPS = ('social.apps.django_app.default',)
SOCIAL_AUTH_VK_OAUTH2_KEY = 'xxx'
SOCIAL_AUTH_VK_OAUTH2_SECRET = 'xxx'
SOCIAL_AUTH_LOGIN_URL = '/app/oauth2login' # URL for callback
#SOCIAL_AUTH_USER_MODEL = 'polls.models.MyUser' # custom user
SOCIAL_AUTH_UID_LENGTH = 223
SOCIAL_AUTH_STRATEGY = 'social.strategies.django_strategy.DjangoStrategy'
SOCIAL_AUTH_STORAGE = 'social.apps.django_app.default.models.DjangoStorage'
SOCIAL_AUTH_PIPELINE = (
'social.pipeline.social_auth.social_details',
'social.pipeline.social_auth.social_uid',
'social.pipeline.social_auth.auth_allowed',
'social.pipeline.social_auth.social_user',
'social.pipeline.user.get_username',
'polls.views.login_vk', # method which works with social network
'social.pipeline.social_auth.associate_user',
'social.pipeline.social_auth.load_extra_data',
'social.pipeline.user.user_details',
)

# 'social.apps.django_app.default', into INSTALLED_APPS

AUTHENTICATION_BACKENDS = (
'social.backends.vk.VKOAuth2', # and other
# setups and becks https://python-social-auth.readthedocs.org/en/latest/backends/index.html
'django.contrib.auth.backends.ModelBackend',
)


urls.py

url(r'^app/', include('social.apps.django_app.urls', namespace='social')),
url(r'^app/oauth2login$', views.oauth2login_view), # views for auth


template

<a href="http://nochgames.ru/app/login/vk-oauth2/" target="blank">Login with VK</a>

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