hi,
    I was using django 1.4 version in window 7. now i am using django 1.5 
version using virtualenv in ubuntu. now i am running my old project it's 
generating error.

error is - 
NoReverseMatch at / 


'url' requires a non-empty first argument. The syntax changed in Django 1.5, 
see the docs.

 Request Method: GET  Request URL: http://127.0.0.1:8000/  Django Version: 
1.5.1  Exception Type: NoReverseMatch  Exception Value: 

'url' requires a non-empty first argument. The syntax changed in Django 1.5, 
see the docs.

 Exception Location: 
/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/defaulttags.py
 
in render, line 402  Python Executable: 
/home/avin/.virtualenvs/DJ/bin/python  Python Version: 2.7.3  Python Path: 

['/home/avin/learnt',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django_socialregistration-0.5.10-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/mock-1.0.1-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/python_openid-2.2.5-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/oauth2-1.5.211-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/httplib2-0.8-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/django_socialregistration-0.5.10-py2.7.egg',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/mock-1.0.1-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/python_openid-2.2.5-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/oauth2-1.5.211-py2.7.egg',
 
'/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages/httplib2-0.8-py2.7.egg',
 '/home/avin/.virtualenvs/DJ/lib/python2.7',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/plat-linux2',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/lib-tk',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/lib-old',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/lib-dynload',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-linux2',
 '/usr/lib/python2.7/lib-tk',
 '/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages',
 '/home/avin/.virtualenvs/DJ/lib/python2.7/site-packages']

 Server time: Mon, 1 Apr 2013 13:10:52 +0530  
 Error during template rendering 

In template /home/avin/learnt/learnt/templates/homepage/index.html, error 
at line *44*
'url' requires a non-empty first argument. The syntax changed in Django 
1.5, see the docs. 34 </div> 35 {% endblock %} 36 {%block navi%} 37 <div 
class="row"> 38 <div class="twelve columns"> 39 <nav class="top-bar"> 40 <ul> 
41 <!-- Title Area --> 42 <li class="name"> 43 <h1> 44 <a href="{% url 
homepage_index %}"> 45 Learning Tracker 46 </a> 47 </h1> 48 </li> 49 <li 
class="toggle-topbar"><a href="#">hhh</a></li> 50 </ul> 51 <ul> 52 <li 
class="name"> 53 <h1> 54 <a class="active" href="{% url homepage_index 
%}">home</a>  
Traceback Switch to copy-and-paste view <http://127.0.0.1:8000/#> 
   
   - 
   
/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/core/handlers/base.pyin
 
   get_response 
   1. 
      
                              response = callback(request, *callback_args, 
**callback_kwargs)
      
      ...
    ▶ Local vars <http://127.0.0.1:8000/#> 
   - /home/avin/learnt/lrntkr/views.py in index 
   1. 
      
          return render_to_response('homepage/index.html', 
ctx,context_instance=RequestContext(request))
      
      ...
    ▶ Local vars <http://127.0.0.1:8000/#> 
   - 
   
/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/shortcuts/__init__.pyin
 
   render_to_response 
   1. 
      
          return HttpResponse(loader.render_to_string(*args, **kwargs), 
**httpresponse_kwargs)
      
      ...
    ▶ Local vars <http://127.0.0.1:8000/#> 
   - 
   
/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/loader.pyin
 
   render_to_string 
   1. 
      
              return t.render(context_instance)
      
      ...
    ▶ Local vars <http://127.0.0.1:8000/#> 
   - 
   
/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/base.pyin
 
   render 
   1. 
      
                  return self._render(context)
      
      ...
    ▶ Local vars <http://127.0.0.1:8000/#> 
   - 
   
/home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/base.pyin
 
   _render 
   1. 
      
              return self.nodelist.render(context)
      
      
Please help me how to remove this.....

THANKS,

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