I'm trying to follow the full example at the bottom of

https://docs.djangoproject.com/en/dev/topics/auth/customizing/

In my model I have modified to the following

date_of_birth = models.DateField(null=True)

However when I try register a user I still get the following error message:

date_of_birth <ul class="errorlist"><li>This field is required.</li></ul>

In what other places do I need to make date_of_birth optional?

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