Hi, I'm using HOT autoscaling with ceilometer alarms. Scale down and scale up policies were successfully triggered, but when my scaling group meet my group minimum size I'm getting the attached error. Ceilometer works fine and Rabbitmq configuration is the same as Heat.

/var/log/heat/heat-engine.log:

2014-07-17 13:46:16.062 8623 ERROR heat.openstack.common.rpc.amqp [req-87797472-dbca-4298-ab42-fd960c9a8cc5 None] Exception during mesage handling
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp Traceback (most recent call last):
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/openstack/common/rpc/mqp.py", line 462, in _process_data
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     **args)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/openstack/common/rpc/ispatcher.py", line 172, in dispatch
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     result = getattr(proxyobj, method)(ctxt, **kwargs)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", lne 63, in wrapped
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     return func(self, ctx, *args, **kwargs)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", lne 890, in resource_signal
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     stack_context = self.load_user_creds(s.user_creds_id)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", lne 308, in load_user_creds
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     hkc.KeystoneClient(stored_context)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/common/heat_keystonecient.py", line 529, in __new__
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     return KeystoneClientV3(context)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/common/heat_keystonecient.py", line 81, in __init__
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     self._client = self._v3_client_init()
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/heat/common/heat_keystonecient.py", line 166, in _v3_client_init
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     client.authenticate()
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/keystoneclient/utils.py", ine 318, in inner
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp     return func(*args, **kwargs)
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/keystoneclient/httpclient.y", line 392, in authenticate
2014-07-17 13:46:16.062 8623 TRACE heat.openstack.common.rpc ...