No Reverse Match Exception

I am using the django generic UpdateView

class UserUpdate(UpdateView):

    model = User

    fields = ['first_name', 'last_name', 'email', 'username']

    template_name = 'Core\MyUpdate.htm'

And my url pattern is this:

url(r'^UpdateMe/(?P<pk>\d+)/$', UserUpdate.as_view(), name='Update')

However, this url  Core/UpdateMe/34/ doesnt seem to match and it gives this error

NoReverseMatch at /Core/UpdateMe/34/

Reverse for 'Update' with arguments '('',)' not found. 1 pattern(s) tried: ['Core/UpdateMe/(?P<pk>\\d+)/$']

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