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It happens if you ran default auth app migrations and later changed the AUTH_USER_MODEL in settings.py. You can try following:
#comments AUTH_USER_MODEL in the settings.py file so it points to a default User Model
Python manage.py migrate auth zero
#Uncomment AUTH_USER_MODEL='recommend.AuthUser'
Python manage.py migrate auth
If it’s doesn’t solve your problems and you are using Sqlite3 you can:
Delete all migration files except __init__.py file.
Source:stackexchange.com