Django 1.7 Type Object 'Migration' has no Attribute 'models'

[ainouye]

When running makemigrations

Traceback (most recent call last):
File "manage.py", line 10, in
execute_from_command_line(sys.argv)
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/core/management/init.py", line 385, in execute_from_command_line
utility.execute()
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/core/management/init.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(_args, *_options.dict)
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(_args, *_options)
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 57, in handle
loader = MigrationLoader(None, ignore_no_migrations=True)
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/db/migrations/loader.py", line 48, in init
self.build_graph()
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/db/migrations/loader.py", line 173, in build_graph
self.load_disk()
File "/Users/allison/tmr/env/lib/python2.7/site-packages/django/db/migrations/loader.py", line 103, in load_disk
migration_module = import_module("%s.%s" % (module_name, migration_name))
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/init.py", line 37, in import_module
import(name)
File "/Users/allison/tmr/env/lib/python2.7/site-packages/social_auth/migrations/0002_auto__add_unique_nonce_timestamp_salt_server_url__add_unique_associati.py", line 19, in
class Migration(SchemaMigration):
File "/Users/allison/tmr/env/lib/python2.7/site-packages/social_auth/migrations/0002_auto__add_unique_nonce_timestamp_salt_server_url__add_unique_associati.py", line 112, in Migration
models.update(custom_user_frozen_models(USER_MODEL))
File "/Users/allison/tmr/env/lib/python2.7/site-packages/social_auth/utils.py", line 270, in custom_user_frozen_models
extra_model = initial_user_migration.migration_class().models
AttributeError: type object 'Migration' has no attribute 'models'

What could be wrong?