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I had the same error after doing a yum update last week (also Havana on CentOS 6.4).  My Horizon package came from the RDO Havana repo and stopped working following this set of updates:

Nov 07 14:41:18 Updated: libudev-147-2.46.el6_4.2.x86_64
Nov 07 14:41:19 Updated: libcom_err-1.41.12-14.el6_4.4.x86_64
Nov 07 14:41:20 Updated: udev-147-2.46.el6_4.2.x86_64
Nov 07 14:41:20 Updated: device-mapper-1.02.77-9.el6_4.3.x86_64
Nov 07 14:41:21 Updated: device-mapper-libs-1.02.77-9.el6_4.3.x86_64
Nov 07 14:41:21 Updated: device-mapper-event-libs-1.02.77-9.el6_4.3.x86_64
Nov 07 14:41:21 Updated: python-six-1.4.1-1.el6.noarch
Nov 07 14:41:22 Updated: 1:python-keystoneclient-0.4.1-3.el6.noarch
Nov 07 14:41:23 Updated: device-mapper-event-1.02.77-9.el6_4.3.x86_64
Nov 07 14:41:23 Updated: lvm2-libs-2.02.98-9.el6_4.3.x86_64
Nov 07 14:41:24 Updated: e2fsprogs-libs-1.41.12-14.el6_4.4.x86_64
Nov 07 14:41:24 Updated: libss-1.41.12-14.el6_4.4.x86_64
Nov 07 14:41:26 Updated: kernel-firmware-2.6.32-358.123.2.openstack.el6.noarch
Nov 07 14:41:27 Updated: libgcrypt-1.4.5-11.el6_4.x86_64
Nov 07 14:41:28 Updated: gnupg2-2.0.14-6.el6_4.x86_64
Nov 07 14:41:34 Installed: kernel-2.6.32-358.123.2.openstack.el6.x86_64
Nov 07 14:41:35 Updated: e2fsprogs-1.41.12-14.el6_4.4.x86_64
Nov 07 14:41:36 Updated: lvm2-2.02.98-9.el6_4.3.x86_64
Nov 07 14:41:36 Updated: python-heatclient-0.2.5-1.el6.noarch
Nov 07 14:41:37 Updated: python-cinderclient-1.0.7-1.el6.noarch
Nov 07 14:41:39 Updated: mdadm-3.2.5-4.el6_4.3.x86_64
Nov 07 14:41:39 Updated: rsync-3.0.6-9.el6_4.1.x86_64
Nov 07 14:41:40 Updated: python-neutronclient-2.3.1-2.el6.noarch
Nov 07 14:41:41 Updated: scsi-target-utils-1.0.38-48.bf6981.ceph.el6.x86_64
Nov 07 14:41:41 Updated: rdo-release-havana-7.noarch
Nov 07 14:41:42 Updated: gdisk-0.8.8-1.el6.x86_64

Per this thread I installed python-pbr and Horizon started working again.  How could I have had Horizon working prior to that yum update if python-pbr was not installed (apparently) and is a Horizon dependency?

Thanks,
Andy

On Nov 8, 2013, at 3:44 AM, Matthias Runge <mrunge at redhat.com> wrote:

> On 11/08/2013 09:25 AM, Stephane EVEILLARD wrote:
>> Hi
>> 
>> when trying to connect to my dashboard (havanna on centos 6.4), I got an
>> 500 internal server error
>> with the following message in /var/log/httpd/error_log
> 
>> (self.SETTINGS_MODULE, e))
>> [Fri Nov 08 09:20:59 2013] [error] [client 192.168.1.200] ImportError:
>> Could not import settings 'openstack_dashboard.settings' (Is it on
>> sys.path?): No module named pbr.version
>> 
> OK,
> I assume you're using a self provided package.
> 
> yum install python-pbr
> 
> from EPEL will provide this dependency.
> 
> Matthias
> 
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