Open Stack

Hi, all

I am having trouble to update a stack.

There's no errors in heat-engine.log.
  The debug shows 'State invalid for UPDATE'

$ heat -d stack-update mystack

DEBUG (http:122)
HTTP/1.1 200 OK
date: Tue, 23 Sep 2014 08:48:34 GMT
content-length: 432
content-type: application/json; charset=UTF-8

{"stacks": [{"description": "", "links": [{"href": 
"http://135.252.167.144:8004/v1/1d179f221cf74bdab48124d0f4e0c6d5/stacks/mystack/6de55d34-d18b-4c61-934e-eae98d969e6c", 
"rel": "self"}], "stack_status_reason": "State invalid for UPDATE", 
"stack_name": "mystack", "creation_time": "2014-09-23T08:00:48Z", 
"updated_time": "2014-09-23T08:28:52Z", "stack_status": "UPDATE_FAILED", 
"id": "6de55d34-d18b-4c61-934e-eae98d969e6c"}]}

+--------------------------------------+-------------+---------------+----------------------+
| id                                   | stack_name  | stack_status | 
creation_time        |
+--------------------------------------+-------------+---------------+----------------------+
| 6de55d34-d18b-4c61-934e-eae98d969e6c | mystack | UPDATE_FAILED | 
2014-09-23T08:00:48Z |
+--------------------------------------+-------------+---------------+----------------------+


Thanks