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I’m copying from a book that is 3 years old so I think this is a
compatibility issue.
3 years is a very long time.
In django 1.4, the verify_exists option was deprecated (this means it was marked for removal), and in 1.5 it was completely removed.
Since 1.5 is the current version, when you install django this is the version that is installed.
As you are going by a book, try to use the same version of django as the book. Otherwise you’ll run into a lot more of these issues.
Or, use a more updated reference. Why not try the official tutorial?
Source:stackexchange.com