Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_from_command_line(sys.argv)
  File "/env/techelec/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/env/techelec/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/env/techelec/local/lib/python2.7/site-packages/django/core/management/base.py", line 294, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/env/techelec/local/lib/python2.7/site-packages/django/core/management/base.py", line 345, in execute
    output = self.handle(*args, **options)
  File "/env/techelec/local/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 176, in handle
    migration_name=self.migration_name,
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 47, in changes
    changes = self._detect_changes(convert_apps, graph)
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 132, in _detect_changes
    self.old_apps = self.from_state.concrete_apps
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 180, in concrete_apps
    self.apps = StateApps(self.real_apps, self.models, ignore_swappable=True)
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 242, in __init__
    self.render_multiple(list(models.values()) + self.real_models)
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 277, in render_multiple
    model.render(self)
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 559, in render
    body,
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/models/base.py", line 157, in __new__
    new_class.add_to_class(obj_name, obj)
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/models/base.py", line 316, in add_to_class
    value.contribute_to_class(cls, name)
  File "/env/techelec/local/lib/python2.7/site-packages/django/db/models/manager.py", line 120, in contribute_to_class
    setattr(model, name, ManagerDescriptor(self))
AttributeError: can't set attribute