libvirt users - May 2013 - Requested operation is not valid: domain is not running but exactly vm is running

hi,all
requested operation is not valid: domain is not running     but exactly vm is
running
when call getCPUStats,interfaceStats...
system:  centos6.3
libvirt-0.9.10-21.el6_3.7.x86_64
libvirt-python-0.9.10-21.el6_3.7.x86_64
thanks


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