ValueError, The view django_bookmarks.bookmarks.views.user_page didn't return an HttpResponse object.

[Naveen Reddy]

Why am i getting this error:
ValueError at /user/naveen_admin/
The view django_bookmarks.bookmarks.views.user_page didn't return an
HttpResponse object.
Request Method: GET
Request URL:    http://localhost:8000/user/naveen_admin/
Exception Type: ValueError
Exception Value:
The view django_bookmarks.bookmarks.views.user_page didn't return an
HttpResponse object.
Exception Location:     C:\Python26\lib\site-packages\django\core\handlers
\base.py in get_response, line 109
Python Executable:      C:\Python26\python.exe
Python Version: 2.6.4
Python Path:    ['D:\\django_workspace\\django_bookmarks', 'C:\
\Python26', 'C:\\WINDOWS\\system32\\python26.zip', 'C:\\Python26\
\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\lib\\plat-win', 'C:\
\Python26\\lib\\lib-tk', 'C:\\Python26\\lib\\site-packages']
Server time:    Sun, 7 Mar 2010 20:07:27 +0530

Here's my views code:
from django.http import HttpResponse, Http404
from django.contrib.auth.models import User
from django.template import Context
from django.template.loader import get_template

def main_page(request):
    template = get_template('main_page.html')
    variables = Context({
        'head_title': 'Django Bookmarks',
        'page_title': 'Welcome to Django Bookmarks',
        'page_body': 'Where you can store and share bookmarks!'
    })
    output = template.render(variables)
    return HttpResponse(output)

def user_page(request, username):
    try:
        user = User.objects.get(username=username)
    except:
            raise Http404('Requested user not found.')
            bookmarks = user.bookmark_set.all()
            template = get_template('user_page.html')
            variables = Context({
                'username': username,
                'bookmarks': bookmarks
    })
            output = template.render(variables)
            return HttpResponse(output)
Please guide me through this. I am absolute beginner to django. Thaks
in advance

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