[Puppet Users] Puppet Dashboard inventory search problems.

I'm using Dashboard 1.2.10 on an Ubuntu 10.04 LTS system, and Puppet 2.7.19

When I do an inventory search, I get a blank screen.

In the logs, I found the following:

Processing NodesController#search (for X.X.X.X at 2012-10-05 08:44:57) [GET]
Parameters: {"action"=>"search", "controller"=>"nodes", "search_params"=>[{"fact"=>"OSFamily", "comparator"=>"eq", "value"=>"Debian"}]}

Errno::EIO (Input/output error):
/usr/lib/ruby/1.8/net/http.rb:564:in `write'
/usr/lib/ruby/1.8/net/http.rb:564:in `warn'
/usr/lib/ruby/1.8/net/http.rb:564:in `connect'
/usr/lib/ruby/1.8/net/http.rb:553:in `do_start'
/usr/lib/ruby/1.8/net/http.rb:542:in `start'
lib/puppet_https.rb:18:in `make_ssl_request'
lib/puppet_https.rb:33:in `get'
app/models/node.rb:85:in `find_from_inventory_search'
app/controllers/nodes_controller.rb:44
app/controllers/nodes_controller.rb:40:in `search'
sass (3.1.2) [v] rails/./lib/sass/plugin/rack.rb:54:in `call'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'

Rendering /usr/share/puppet-dashboard/public/500.html (500 Internal Server Error)

Any ideas as to the cause?