When trying to build a VM, it fails during the provisioning stage with this error:
device-mapper: table: 253:9: dm-8 too small for target: start=2048, len=62908416, dev_size=41943040
Linux VMs on KVM, Windows VMs on XEN / KVM
Increase the size of the primary disk for the VM and then rebuild the machine again. There might be some trial and error involved in order to find the right disk size that works for you.
Generally, this means that the disk size you are trying to use is too small for the minimum requirement from the template to be met.