Open Stack

Hi All:
I have a problem about openstack autoscaling by template! I have added 4 networks in my system (from horizon web portal),
But when I executed the template, it failed! So I checked Heat log, I found some errors:

2014-01-14 09:30:00.711 1351 ERROR heat.engine.resource [-] CREATE : AutoScalingGroup "WebServerGroup"
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource Traceback (most recent call last):
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource   File "/usr/lib/python2.7/dist-packages/heat/engine/resource.py", line 361, in _do_action
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource     while not check(handle_data):
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource   File "/usr/lib/python2.7/dist-packages/heat/engine/resources/autoscaling.py", line 353, in check_create_complete
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource     done = super(AutoScalingGroup, self).check_create_complete(task)
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource   File "/usr/lib/python2.7/dist-packages/heat/engine/resources/autoscaling.py", line 150, in check_create_complete
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource     done = super(InstanceGroup, self).check_create_complete(task)
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource   File "/usr/lib/python2.7/dist-packages/heat/engine/stack_resource.py", line 116, in check_create_complete
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource     raise exception.Error(self._nested.status_reason)
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource Error: Resource create failed: BadRequest: Multiple possible networks found, use a Network ID to be more specific. (HTTP 400) (Request-ID: req-b7f18922-5e13-4799-b623-9e7127c5ae2b)
2014-01-14 09:30:00.711 1351 TRACE heat.engine.resource
2014-01-14 09:30:01.152 1351 WARNING heat.engine.service [-] Stack create failed, status FAILED

I check the resource of AutoScalingGroup(AWS::AutoScaling::AutoScalingGroup), I can not find some parameters to set the Network ID.

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