python-social-auth migrate error

gistfile1.txt

(env)vagrant@ubuntu-12:/vagrant/summit$ python manage.py migrate --settings=summit.olpcsf_setti
ngs
Traceback (most recent call last):
  File "manage.py", line 13, in <module>
    execute_manager(settings)
  File "/vagrant/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 459, in execute_manager
    utility.execute()
  File "/vagrant/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/vagrant/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/vagrant/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/vagrant/env/local/lib/python2.7/site-packages/south/management/commands/migrate.py", line 107, in handle
    ignore_ghosts = ignore_ghosts,
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/__init__.py", line 166, in migrate_app
    Migrations.calculate_dependencies()
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/base.py", line 227, in calculate_dependencies
    migration.calculate_dependencies()
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/base.py", line 358, in calculate_dependencies
    for migration in self._get_dependency_objects("depends_on"):
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/base.py", line 338, in _get_dependency_objects
    for app, name in getattr(self.migration_class(), attrname, []):
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/base.py", line 310, in migration_class
    return self.migration().Migration
  File "/vagrant/env/local/lib/python2.7/site-packages/south/utils/__init__.py", line 62, in method
    value = function(self)
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/base.py", line 299, in migration
    raise exceptions.UnknownMigration(self, sys.exc_info())
south.exceptions.UnknownMigration: Migration 'default:0001_initial' probably doesn't exist.
Traceback (most recent call last):
  File "/vagrant/env/local/lib/python2.7/site-packages/south/migration/base.py", line 297, in migration
    migration = __import__(full_name, {}, {}, ['Migration'])
  File "/vagrant/env/local/lib/python2.7/site-packages/social/apps/django_app/default/migrations/0001_initial.py", line 4, in <module>
    from django.db import models, migrations
ImportError: cannot import name migrations