After installing the revisor rpm only it fails at runtime with Virtualization options specified, but no virt module found. Install revisor-virt. But AFAICT I haven't specified any virtualization options. I don't even know what it is.
The message is shown because the default values self.virt_xen_size = 3000 and self.virt_fstype = "ext3"
Has been fixed.
Metadata Update from @kiilerix@gmail.com: - Issue set to the milestone: 2.0.5 (EL-5)