Error al empujar el proyecto Django a Heroku

He estado tratando de corregir este error durante aproximadamente una hora y me he quedado sin soluciones, así que por favor, ayúdenme.

Heroku crear

corre bien sin problemas

git push heroku master

    Counting objects: 119, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (118/118), done.
Writing objects: 100% (119/119), 1.39 MiB | 66 KiB/s, done.
Total 119 (delta 4), reused 0 (delta 0)
-----> Python app detected
-----> No runtime.txt provided; assuming python-2.7.3.
-----> Preparing Python runtime (python-2.7.3)
-----> Installing Distribute (0.6.34)
-----> Installing Pip (1.2.1)
-----> Installing dependencies using Pip (1.2.1)
       Downloading/unpacking Django==1.4.3 (from -r requirements.txt (line 1))
         Running setup.py egg_info for package Django

       Downloading/unpacking dj-database-url==0.2.1 (from -r requirements.txt (line 2))
         Downloading dj-database-url-0.2.1.tar.gz
         Running setup.py egg_info for package dj-database-url

       Downloading/unpacking psycopg2==2.4.6 (from -r requirements.txt (line 3))
         Running setup.py egg_info for package psycopg2

           no previously-included directories found matching 'doc/src/_build'
       Downloading/unpacking virtualenv==1.8.4.post1 (from -r requirements.txt (line     4))
         Could not find a version that satisfies the requirement virtualenv==1.8.4.post1 (from -r requirements.txt (line 4)) (from versions: )
       No distributions matching the version for virtualenv==1.8.4.post1 (from -r requirements.txt (line 4))
       Storing complete log in /app/.pip/pip.log
 !     Heroku push rejected, failed to compile Python app

 To [email protected]:[blocked].git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to '[email protected]:[blocked].git'

archivo de requisitos:

 >Django==1.4.3
 >dj-database-url==0.2.1
 >psycopg2==2.4.6
 >virtualenv==1.8.4.post1

archivo

web: python manage.py runserver 0.0.0.0:$PORT --noreload

Heroku Registros:

    The 'heroku' gem has been deprecated and replaced with the Heroku Toolbelt, download and install from https://toolbelt.heroku.com.

2013-01-24T01:22:06+00:00 heroku[api]: Enable Logplex by [private email]@yahoo.com
2013-01-24T01:22:06+00:00 heroku[api]: Release v2 created by [private email]@yahoo.com
2013-01-24T01:22:42+00:00 heroku[slugc]: Slug compilation started
2013-01-24T01:23:38+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app
2013-01-24T01:43:26+00:00 heroku[slugc]: Slug compilation started
2013-01-24T01:43:51+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app
2013-01-24T02:27:36+00:00 heroku[slugc]: Slug compilation started
2013-01-24T02:28:08+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app
2013-01-24T02:32:08+00:00 heroku[slugc]: Slug compilation started
2013-01-24T02:32:32+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app
2013-01-24T02:43:32+00:00 heroku[slugc]: Slug compilation started
2013-01-24T02:43:59+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app
2013-01-24T02:46:23+00:00 heroku[slugc]: Slug compilation started
2013-01-24T02:46:52+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app
2013-01-24T02:49:48+00:00 heroku[slugc]: Slug compilation started
2013-01-24T02:50:26+00:00 heroku[slugc]: Slug compilation failed: failed to compile Python app

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