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[Julie Pichon <1288700@xxxxxxxxxxxxxxxxxx>]

Thanks for the report. This is a nova error that Horizon can't do much
about. Could you provide the output of the following command to see if
the error can be reproduced using the nova client?

$ nova hypervisor-list

** Also affects: nova
   Importance: Undecided
       Status: New

** Changed in: horizon
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1288700

Title:
  Unable to list hypervisors information

Status in OpenStack Dashboard (Horizon):
  Invalid
Status in OpenStack Compute (Nova):
  New

Bug description:
  While accessing the horizon dashboard,

  I'm unable to list the Hypervisors.

  The python-six version has been updated from 1.3.0 fc19 package to
  1.5.2 using pip.

  However, the error is the following:

  
  2014-03-06 12:46:20.399 31393 TRACE nova.api.openstack.wsgi 
  2014-03-06 12:46:20.724 31393 ERROR nova.api.openstack.wsgi [req-3875bd6c-b142-448c-91a0-8a9f21e7acc6 myUser 8e067beb179c49fdaa553e80024fa3ba] Exception handling resource: 'NoneType' object has no attribute '__getitem__'
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi Traceback (most recent call last):
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/openstack/wsgi.py", line 997, in _process_stack
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi     action_result = self.dispatch(meth, request, action_args)
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/openstack/wsgi.py", line 1078, in dispatch
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi     return method(req=request, **action_args)
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/contrib/hypervisors.py", line 175, in detail
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi     for hyp in compute_nodes])
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/contrib/hypervisors.py", line 148, in _view_hypervisor
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi     'host': hypervisor['service']['host'],
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi TypeError: 'NoneType' object has no attribute '__getitem__'
  2014-03-06 12:46:20.724 31393 TRACE nova.api.openstack.wsgi

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