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Stein on rhel7.6: No valid host was found.There are not enough hosts available.

After creating 13 nodes by heat template, the 14th node throws the error "No valid host was found. There are not enough hosts available. Code: 500"

824 2019-06-05 13:58:47.946 7100 WARNING nova.scheduler.utils [req-0673d8fa-dc10-4167-ae3d-e7c54165dc87 ad73023f983a49e1a5c38e4ba0        b8d116 76c7bf1ad0dc4a5696fcf8a5400cad6e - default default] Failed to compute_task_build_instances: No valid host was found. Th        ere are not enough hosts available.
825 Traceback (most recent call last):
826 
827   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 229, in inner
828     return func(*args, **kwargs)
829 
830   File "/usr/lib/python2.7/site-packages/nova/scheduler/manager.py", line 168, in select_destinations
831     allocation_request_version, return_alternates)
832 
833   File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 96, in select_destinations
834     allocation_request_version, return_alternates)
835 
836   File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 265, in _schedule
837     claimed_instance_uuids)
838 
839   File "/usr/lib/python2.7/site-packages/nova/scheduler/filter_scheduler.py", line 302, in _ensure_sufficient_hosts
840     raise exception.NoValidHost(reason=reason)
841 
842 NoValidHost: No valid host was found. There are not enough hosts available.
843 : NoValidHost_Remote: No valid host was found. There are not enough hosts available.
844 2019-06-05 13:58:47.949 7100 WARNING nova.scheduler.utils [req-0673d8fa-dc10-4167-ae3d-e7c54165dc87 ad73023f983a49e1a5c38e4ba0        b8d116 76c7bf1ad0dc4a5696fcf8a5400cad6e - default default] [instance: 7acedfd0-8951-4ade-8f96-467c38b04f9c] Setting instance t        o ERROR state.: NoValidHost_Remote: No valid host was found. There are not enough hosts available.

I think my resource is enough.