Reverse for 'resetPasswordSendMail' with arguments '()' and keyword arguments '{}' not found. 1 pattern(s) tried: [u'$resetPasswordSendMail/$']

I am getting the error mentioned in the heading. The reverse url is working perfectly everywhere in the html code except in the form action part. The code works perfectly when I do not use namespaces in my project which right now has only one app. Example: {% url 'view_name' %} instead of {% url 'app_name:view_name' %} )

urls.py

from django.conf.urls import url, include  from django.contrib import admin  from account import views  from django.core.urlresolvers import reverse    app_name = 'account'    urlpatterns = [      #url(r'^admin/', admin.site.urls),      url(r'^$', views.login, name='login' ),      url(r'^login/$', views.login, name='login'),      url(r'^forgotPassword/$', views.forgotPassword, name='forgotPassword'),      url(r'^resetPasswordSendMail/$', views.resetPasswordSendMail, name='resetPasswordSendMail'),  ]

I am getting the error mentioned in the heading. The reverse url is working perfectly everywhere in the html code except in the form action part. The code works perfectly when I do not use namespaces in my project which right now has only one app. Example: {% url 'view_name' %} instead of {% url 'app_name:view_name' %} )
urls.py
from django.conf.urls import url, include  from django.contrib import admin  from account import views  from django.core.urlresolvers import reverse    app_name = 'account'    urlpatterns = [      #url(r'^admin/', admin.site.urls),      url(r'^$', views.login, name='login' ),      url(r'^login/$', views.login, name='login'),      url(r'^forgotPassword/$', views.forgotPassword, name='forgotPassword'),      url(r'^resetPasswordSendMail/$', views.resetPasswordSendMail, name='resetPasswordSendMail'),  ]
ForgotPassword.html
<form method="POST" role="form" id="forgotPassword" action="{% url 'account:resetPasswordSendMail' %}"> {% csrf_token %}

Views.py
def resetPasswordSendMail(request):      # code follows....

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