error with new version of django.

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

• /home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/core/handlers/base.py in get_response

  115.                         response = callback(request, *callback_args, **callback_kwargs)

       ...
  ▶ Local vars
• /home/avin/learnt/lrntkr/views.py in index

  15.     return render_to_response('homepage/index.html', ctx,context_instance=RequestContext(request))  

      ...
  ▶ Local vars
• /home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/shortcuts/__init__.py in render_to_response

  29.     return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)

      ...
  ▶ Local vars
• /home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/loader.py in render_to_string

  177.         return t.render(context_instance)

       ...
  ▶ Local vars
• /home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/base.py in render

  140.             return self._render(context)

       ...
  ▶ Local vars
• /home/avin/.virtualenvs/DJ/local/lib/python2.7/site-packages/django/template/base.py in _render

  134.         return self.nodelist.render(context)

Please help me how to remove this.....

THANKS,

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