[libvirt] error of libvirt live-migrate using spice: Unable to read from monitor

hi all: I have a problem when I live-migrate a instance to other node. I use the spice protocol in a instance. when I use the command: virsh migrate --live instance-00000001 qemu+tcp://node1/system. The 'node1' is the hostname of the dest compute. The error is: error: Unable to read from monitor: Connection reset by peer I can migrate successful When I remove the spice protocol. But I must use the spice. I think I need install something. My environmental is: Centos 6.2 libvirt 0.10.1 qemu-kvm 0.15.0 spice 0.11-11 Who can help me. 2012-10-18 yangzhenyu