在settings.py中增加
INSTALLED_APPS = [ ... 'django.contrib.sites', ]
问题就解决了。什么原因。——不知道。。
具体请看：
https://stackoverflow.com/questions/35388637/runtimeerror-model-class-django-contrib-sites-models-site-doesnt-declare-an-ex
doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.
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