PLease, run

$ sudo yum -y remove python-django
$ sudo yum -y install python-django14

If it won't help , then rerun

$ sudo packstack --answer-file=/home/../answer-file-name

one more time.

>

Subject: Re: [Rdo-list] Horizon in fresh install of Havana not working
From: dfv@eurotux.com
Date: Fri, 25 Oct 2013 18:37:43 +0100
CC: rdo-list@redhat.com
To: bderzhavets@hotmail.com

On Oct 25, 2013, at 6:28 PM, Boris Derzhavets <bderzhavets@hotmail.com> wrote:

> I seem to have read somewhere that a 500 status in horizon may be caused by one of the others components failing. So I'm assuming this could be my problem.

Please, run 

# rpm -qa | grep python-django

Sure:

[root@openstack ~(keystone_admin)]# rpm -qa | grep python-django
python-django-appconf-0.6-1.fc19.noarch
python-django-1.5.4-1.fc19.noarch
python-django-openstack-auth-1.1.2-1.fc21.noarch
python-django-compressor-1.3-1.fc19.noarch
python-django-horizon-2013.2-1.fc20.noarch

Thank you,

Diogo Vieira