added edit task url to urls.py and removed add_task url .
from django.conf.urls.defaults import *
# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()
from pytask.taskapp.views.user import homepage, register, user_login, user_logout, view_my_profile, edit_my_profile, browse_users
from pytask.taskapp.views.task import browse_tasks, view_task, create_task, add_mentor, add_tasks, claim_task, assign_task
from pytask.taskapp.utils.seed_db import seed_db
urlpatterns = patterns('',
# Example:
# (r'^pytask/', include('pytask.foo.urls')),
# Uncomment the admin/doc line below and add 'django.contrib.admindocs'
# to INSTALLED_APPS to enable admin documentation:
# (r'^admin/doc/', include('django.contrib.admindocs.urls')),
(r'^$', homepage),
(r'^task/browse/$', browse_tasks),
(r'^task/view/tid=(\d+)$', view_task),
(r'^task/create/$', create_task),
(r'^task/addmentor/tid=(\d+)', add_mentor),
#(r'^task/addtasks/tid=(\d+)', add_tasks),
(r'^task/edit/tid=(\d+)', edit_task),
(r'^task/claim/tid=(\d+)', claim_task),
(r'^task/assign/tid=(\d+)', assign_task),
(r'^admin/', include(admin.site.urls)),
(r'^accounts/register/$',register),
(r'^accounts/login/$',user_login),
(r'^accounts/logout/$',user_logout),
(r'^user/view/uid=(\d+)$', view_my_profile),
(r'^user/edit/?$', edit_my_profile),
(r'^user/browse/?$',browse_users),
(r'^seed_db/$', seed_db),
)