使用python manage.py startapp blog命令报错traceback

在原有的环境下python3.8，django1.10.0的虚拟环境下生成项目应用，使用python manage.py startapp blog命令报错=>RuntimeError: class not set defining ‘AbstractBaseUser’ as <class ‘django.contrib.auth.base_user.AbstractBaseUser’>. Was

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