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Hi, Experts

I am writing a template to start a multi node devstack cloud inside overcloud. Heat Engine got exception after started the first controller VM. I am using the latest Heat code.
Here is the stack trace:

Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 ERROR oslo_messaging.rpc.dispatcher [req-f8fbb6d4-924d-4c0c-8b60-16ed30358765 ] Exception during message handling: object of type 'NoneType' has no len()
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/osprofiler/profiler.py", line 105, in wrapper
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     return f(*args, **kwargs)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/heat/engine/service.py", line 74, in wrapped
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     return func(self, ctx, *args, **kwargs)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/heat/engine/service.py", line 1386, in show_software_config
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     sc = db_api.software_config_get(cnxt, config_id)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/heat/db/api.py", line 258, in software_config_get
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     return IMPL.software_config_get(context, config_id)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/heat/db/sqlalchemy/api.py", line 717, in software_config_get
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     result = model_query(context, models.SoftwareConfig).get(config_id)
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher   File "/opt/stack/venvs/heat/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 818, in get
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher     if len(ident) != len(mapper.primary_key):
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher TypeError: object of type 'NoneType' has no len()
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.733 138441 TRACE oslo_messaging.rpc.dispatcher
Feb  4 15:10:21 minicloud-allinone-controller0-i7bnc6baumzl heat-engine: 2015-02-04 15:10:21.735 138441 ERROR oslo_messaging._drivers.common [req-f8fbb6d4-924d-4c0c-8b60-16ed30358765 ] Returning exception object of type 'NoneType' has no len() to caller

Is there anything wrong with the template (it's attached)? Or I met a bug inside Heat? 
Thanks a lot.

BR
Zhou Zhenzan
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