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When writing code is not used due to the database, so the code is written in Django time, has not been used python manage.py makemigrations command, the results of running time has not come out picture verification code 

Always thought it was a problem font path, a path later found no problems

Error message is no such table: django_sessionno such table: django_session

The original app is not migrated application does not work  

Solution: python manage.py makemigrations 

Then execute python manage.py migrate 

Then run python manage.py runserver solved