django error

錯誤資訊：You're using the Django "sites framework" without having set the SITE_ID setting. Create a site in your database and set the SITE_ID setting to fix this error.

  原因：settings.py裡# Application definition中添加了'django.contrib.sites'子產品後需要設定SITE_ID 

  處理：在settings.py裡添加配置：SITE_ID = 1

Database returned an invalid value in QuerySet.datetimes(). Are time zone definitions for your database and pytz installed?