Using Virt-Manager 1.2.1 on 14.04. / Xen 4.4 from repos. Cannot create VM machine because this error crops up on virt-manager.
This is after editing
/etc/xen/xend-config.sxp to allow virt-manager to work and restarting libvirt and xen services.
Closest clue is from the OpenSuse forums which suggest Apparmor and libvirtd are in conflict. Solution seemed to be to disable Apparmor. Apparmor does not seem installed though.