How do you use virt-sysprep

We're running RHEV 4.1 and I'm trying to use virt-sysprep to create a clean OS template. When I power off the VM and go to any of the hypervisors, and try to execute virt-sysprep -d it fails with the error listed below.

If it makes a difference, we're using pre-allocated disks, not thin.
Thanks for any assistance,

virt-sysprep: error: libguestfs error: no libvirt domain called
'RHEL7_tmpl': Domain not found: no domain with matching name 'RHEL7_tmpl'

If reporting bugs, run virt-sysprep with debugging enabled and include the
complete output:

virt-sysprep -v -x [...]