[Haizea] What's the reason to print following error? Enactment of end VM failed:

[柯俊峰]

What's the reason to print following error?
[2009-11-30 14:54:46.99] VMSCHED Started VMs for lease 3 on nodes [1, 1, 3]
[2009-11-30 14:54:47.61] CLOCK   Going back to sleep. Waking up at
2009-11-30 14:55:43.00 to handle slot table event.
[2009-11-30 14:55:43.00] CLOCK   Waking up to manage resources
[2009-11-30 14:55:43.00] CLOCK   Wake-up time recorded as 2009-11-30
14:55:43.00
[2009-11-30 14:55:43.00] VMSCHED Stopped VMs for lease 3 on nodes [1, 1, 3]
[2009-11-30 14:55:43.48] RPOOL   Enactment of end VM failed: Error when
invoking 'vm.shutdown': ONE reported an error: Wrong state to perform action
[2009-11-30 14:55:43.48] VMSCHED Enactment error when shutting down VMs.
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