[libvirt] Doubt over Kvm migration support in libvirt 0.5.0

I am using libvirt(python) to develop a small application which will manage my nodes which running in KVM. But when i tried migration i got this error. libvir: error : this function is not supported by the hypervisor: virDomainMigrate Traceback (most recent call last): File "<stdin>", line 1, in ? File "/usr/lib64/python2.4/site-packages/libvirt.py", line 301, in migrate if ret is None:raise libvirtError('virDomainMigrate() failed', dom=self) libvirt.libvirtError: virDomainMigrate() failed this function is not supported by the hypervisor: virDomainMigrate i am running kvm-66 taken from Centos-5 Testing repositary and libvirt 0.5.0( 0.5.0: Nov 25 2008 release note says that support for kvm migration included) i am bit confused after reading this... Please any one help me in this. Thanks and Regards, -Shan