check the --libvirt-type if it is "kvm" then change it to --libvirt-type=qemu in /etc/nova/nova-compute.conf and reboot the machine your bug will get resolved
check the --libvirt-type if it is "kvm" then nova-compute. conf
change it to --libvirt-type=qemu in /etc/nova/
and reboot the machine
your bug will get resolved