when nova boot

[liuwenyuan2016]

ault | {u'message': u'NoValidHost', u'code': 50 0, u'details': u'No valid host was found. |
| | File "/usr/lib/python2.7/dist-packages /nova/scheduler/filter_scheduler.py", line 97, in schedule_run_instance |
| | raise exception.NoValidHost(reason=" ") |
| | ', u'created': u'2016-09-13T08:27:38Z'} |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-AZ:availability_zone | nova |
| config_drive |

[uksysadmin]

Can you paste the command line you used to boot the instance?
Can you paste the output of: nova service-list

Thanks!