Cannot delete server if the instance in 'BUILD' status

When my openstack fails to launch a vnf, the instance/server it created is still in BUILD state and cannot be deleted using this command:

`openstack server delete <instance id or name>`

The result is always like this:

`No server with a name or ID of '<instance id of name>' exists.`

Then the server stucks there forever.

Here is the nova logs when running openstack server delete:

 Policy check for os_compute_api:os-hide-server-addresses failed with credentials {'service_roles': [], 'user_id': u'e42e5ff4d57847ab88f5339e6c167e3f', 'roles': [u'admin', u'service'], 'user_domain_id': u'default', 'service_project_id': None, 'service_user_id': None, 'service_user_domain_id': None, 'service_project_domain_id': None, 'is_admin_project': True, 'is_admin': True, 'project_id': u'961d3c0c9c1c4ba4924b0791562574aa', 'project_domain_id': u'default'} {{(pid=7706) authorize /opt/stack/nova/nova/policy.py:168}}