[libvirt] 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