To solve the Site matching query does not exist error, you must first switch to the shell screen or create a py file and write the following codes.
python3.6 manage.py shellfrom django.contrib.sites.models import SiteSite.objects.create(domain='teknosos.com', name='teknosos.com')
Site.objects.create(domain='www.teknosos.com', name='www.teknosos.com')
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