Error running developmental server in Django project some issue with migration

I have developed a project for SASS with django tenate. While migratiing, I got the following error

it seems, like it is related to migration file.

(acc_venv) D:\\workik_projects\\AccrediDoc_v2\>py manage.py makemigrations report
  
Traceback (most recent call last):
  
  File "D:\\workik_projects\\AccrediDoc_v2\\manage.py", line 22, in \<module\>
  
    main()
  
  File "D:\\workik_projects\\AccrediDoc_v2\\manage.py", line 19, in main
  
    execute_from_command_line(sys.argv)
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\core\\management\\\__init_\_.py", line 442, in execute_from_command_line
  
    utility.execute()
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\core\\management\\\__init_\_.py", line 436, in execute
  
    self.fetch_command(subcommand).run_from_argv(self.argv)
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\core\\management\\base.py", line 416, in run_from_argv
  
    self.execute(\*args, \*\*cmd_options)
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\core\\management\\base.py", line 457, in execute
  
    self.check(\*\*check_kwargs)
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\core\\management\\base.py", line 492, in check
  
    all_issues = checks.run_checks(
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\core\\checks\\registry.py", line 89, in run_checks
  
    new_errors = check(app_configs=app_configs, databases=databases)
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\contrib\\auth\\checks.py", line 101, in check_user_model
  
    if isinstance(cls().is_anonymous, MethodType):
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\db\\models\\base.py", line 537, in \__init_\_
  
    val = field.get_default()
  
  File "D:\\workik_projects\\AccrediDoc_v2\\acc_venv\\lib\\site-packages\\django\\db\\models\\fields\\related.py", line 1176, in get_default
  
    if isinstance(field_default, self.remote_field.model):
  
TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union

Check the fields you define, looks like you assign an object to default anywhere

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