Reverse for ''profiles_profile_detail'' with arguments

home.html

{% if user.is_authenticated %}
<a href="{% url 'profiles_profile_detail' user.username %}">Mon compte</a>
{% endif %}

urls.py

l'appel du urls.py issue du module django-profiles :

    url(r'^profiles/', include('profiles.urls')),

j'obtiens l'erreur :
Reverse for ''profiles_profile_detail'' with arguments '(u'foxmask',)' and keyword arguments '{}' not found.

views.py

from django.template import Context, loader
from monsite.models import Histo
from django.http import HttpResponse

def home(request):
    latest_histo_list = Histo.objects.all().order_by('-date_created')[:5]
    t = loader.get_template('home.html')
    c = Context({
        'latest_histo_list': latest_histo_list,
        'user': request.user
    })
    return HttpResponse(t.render(c))    

solution
{% if user.is_authenticated %}
Mon compte
{% endif %}

sans quote