newbie error

Hi Friends! I'm working with django and i have this error:

Request Method: GET
Request URL: http://127.0.0.1:8000/myapp/New_page/
Django Version: 1.2.3
Exception Type: ValueError
Exception Value:

invalid literal for int() with base 10: 'New_page'

Exception Location: /usr/local/lib/python2.6/dist-packages/django/db/
models/fields/__init__.py in get_prep_value, line 479
Python Executable: /usr/bin/python
Python Version: 2.6.4

Resume, i want that the identify of my webs will be the title of the
page. Now, i'm using the "id" of the page, but i want to put the
page.title instead page.id

The structure of url is :

url(r'^(?P<page_title>[^/]+)/$', 'view_page'),

is correct?

and function view_page is:

def view_page(request, page_title):

if request.user.is_authenticated():
page_qs = Page.objects.filter(Q(id=page_title) &
(Q(author=request.user)|Q(public=True)))
else:
page_qs = Page.objects.filter(id=page_title, public=True)

if page_qs.count() == 0:
raise HttpResponseNotAllowed()

pag = page_qs[0]

return render_to_response(
"v/schema.html",
{"pag":pag},
context_instance=RequestContext(request))

Someone who wants help me?!!

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