RESP BODY: {"computeFault": {"message": "Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.\n<type 'exceptions.ValueError'>", "code": 500}}

DEBUG (shell:909) Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<type 'exceptions.ValueError'> (HTTP 500) (Request-ID: req-8209faa4-cbbe-470a-ac68-0ef01a9d250d)
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/novaclient/shell.py", line 907, in main
    OpenStackComputeShell().main(argv)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/shell.py", line 834, in main
    args.func(self.cs, args)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/v2/shell.py", line 524, in do_boot
    server = cs.servers.create(*boot_args, **boot_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/v2/servers.py", line 995, in create
    **boot_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/v2/servers.py", line 541, in _boot
    return_raw=return_raw, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/base.py", line 172, in _create
    _resp, body = self.api.client.post(url, body=body)
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/adapter.py", line 176, in post
    return self.request(url, 'POST', **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/client.py", line 93, in request
    raise exceptions.from_response(resp, body, url, method)
ClientException: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<type 'exceptions.ValueError'> (HTTP 500) (Request-ID: req-8209faa4-cbbe-470a-ac68-0ef01a9d250d)
ERROR (ClientException): Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
<type 'exceptions.ValueError'> (HTTP 500) (Request-ID: req-8209faa4-cbbe-470a-ac68-0ef01a9d250d)