Operations to perform:
  Synchronize unmigrated apps: sessions, auth, contenttypes, admin, app_sec
  Apply all migrations: app_main
Synchronizing apps without migrations:
  Creating tables...
  Installing custom SQL...
  Installing indexes...
Running migrations:
  Applying app_main.0001_initial...Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 427, in execute_from_command_line
    utility.execute()
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 419, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/core/management/base.py", line 337, in execute
    output = self.handle(*args, **options)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 146, in handle
    executor.migrate(targets, plan, fake=options.get("fake", False))
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/db/migrations/executor.py", line 62, in migrate
    self.apply_migration(migration, fake=fake)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/db/migrations/executor.py", line 96, in apply_migration
    migration.apply(project_state, schema_editor)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/db/migrations/migration.py", line 107, in apply
    operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/db/migrations/operations/models.py", line 27, in database_forwards
    apps = to_state.render()
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/db/migrations/state.py", line 68, in render
    raise InvalidBasesError("Cannot resolve bases for %r" % new_unrendered_models)
django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [<django.db.migrations.state.ModelState object at 0x7fcbf8b164e0>]