RuntimeError: Model class apps.user.models.User doesn't declare an explicit app_label and isn't i...

RuntimeError: Model class apps.user.models.User doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.. 错误

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解决：路径的问题，相对路径与绝对路径之间搞起来，不停的测试就知道咋回事了。