i have the same problem on a test install.
When changing /etc/openstack-dashboard/local_settings.py  so i have debug, this 
is the kind of error i have:

[Fri Jul 20 10:04:28 2012] [error]   File 
"/usr/lib/python2.7/dist-packages/horizon/forms/base.py", line 99, in 
maybe_handle
[Fri Jul 20 10:04:28 2012] [error]     return form, form.handle(request, 
form.cleaned_data)
[Fri Jul 20 10:04:28 2012] [error]   File 
"/usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py", 
line 88, in handle
[Fri Jul 20 10:04:28 2012] [error]     redirect=request.build_absolute_uri())
[Fri Jul 20 10:04:28 2012] [error]   File 
"/usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py", 
line 81, in handle
[Fri Jul 20 10:04:28 2012] [error]     's3_url': api.url_for(request, 's3'),
[Fri Jul 20 10:04:28 2012] [error]   File 
"/usr/lib/python2.7/dist-packages/horizon/api/base.py", line 112, in url_for
[Fri Jul 20 10:04:28 2012] [error]     raise 
exceptions.ServiceCatalogException(service_type)
[Fri Jul 20 10:04:28 2012] [error] ServiceCatalogException: Invalid service 
catalog service: s3

I do not have swift installed, but my "manager node" runs nova-storage with 
some s3 thingy.
Excerpt from my nova.conf:
--s3_host=192.168.122.4
--s3_port=3333

Looks like horizon is not able to get the value of s3_url (
api.url_for(request, 's3')).

As a workaround, if i change 
/usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py so i 
hard code the s3 url in the code, it "works":

ubuntu@messaging:~$ diff -u 
/usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py-vanilla
 /usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py
--- 
/usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py-vanilla
  2012-07-20 10:57:02.000000000 +0100
+++ /usr/lib/python2.7/dist-packages/horizon/dashboards/settings/juju/forms.py  
2012-07-20 10:58:02.000000000 +0100
@@ -78,7 +78,7 @@
             context = {'ec2_access_key': keys.access,
                        'ec2_secret_key': keys.secret,
                        'ec2_url': api.url_for(request, 'ec2'),
-                       's3_url': api.url_for(request, 's3'),
+                       's3_url': 'http://192.168.122.4:3333',
                        'juju_admin_secret': uuid.uuid4().hex,
                        'control_bucket': control_bucket
                       }


I do not know exactly how horizon is getting service catalog entry, but it 
looks like there s one missing on mine.

This is what keystone service-list tells:

ubuntu@messaging:~$ keystone service-list
+----------------------------------+----------+--------------+----------------------------+
|                id                |   name   |     type     |        
description         |
+----------------------------------+----------+--------------+----------------------------+
| 1585378098384e00a6db821ca638ecc6 | glance   | image        | OpenStack Image 
Service    |
| 2b66256adc5e4282afd631b58c15ad57 | keystone | identity     | OpenStack 
Identity Service |
| 7f22b61afcce43be80252083fbc21341 | nova     | compute      | OpenStack 
Compute Service  |
| 99eab6fe63774934ad4dee5709c57187 | ec2      | ec2          | OpenStack EC2 
Service      |
| 9f46367719dd4505984d0f35fd3347db | volume   | volume       | Openstack Volume 
Service   |
| ca32c592aac74d4b9e1d26da43b74a2d | swift    | object-store | OpenStack 
Storage Service  |
+----------------------------------+----------+--------------+----------------------------+

now, i have a swift endpoint (that i defined in case i would install it)
but no swift is installed.

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https://bugs.launchpad.net/bugs/988748

Title:
  Downloading Juju settings causes 500 Internal Server Error

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