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At the moment, Horizon expects all services in the Keystone catalogue to be up and running. From the traceback you posted it looks like Neutron is in the catalogue but is not currently working (you should be able to check by doing e.g. $ neutron net-list on the command-line).
You should first look into fixing Neutron to make sure the service is up and working correctly, then try again to connect to Horizon.
Other pages that don't require Neutron should still be working (e.g. /admin/users/).
