Operations to perform:
  Synchronize unmigrated apps: app_sec, admin, contenttypes, auth, sessions
  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 "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/apps/config.py", line 152, in get_model
    return self.models[model_name.lower()]
KeyError: 'classpg'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/db/migrations/state.py", line 76, in render
    model = self.apps.get_model(lookup_model[0], lookup_model[1])
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/apps/registry.py", line 190, in get_model
    return self.get_app_config(app_label).get_model(model_name.lower())
  File "/var/local/venvs/cms-1.7-3.4/lib/python3.4/site-packages/django/apps/config.py", line 155, in get_model
    "App '%s' doesn't have a '%s' model." % (self.label, model_name))
LookupError: App 'app_main' doesn't have a 'classpg' model.

During handling of the above exception, another exception occurred:

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 86, in render
    model=lookup_model,
ValueError: Lookup failed for model referenced by field app_sec.ClassA.page: app_main.ClassPg