SLES12 and latest updates. Installed Xen and Xen tools. Reboot and select the SLES12 with Xen option. Click on create VM in yast and select CDROM media install. Made 2048GB RAM with 108GB drive. Used br0 for the bridge. Click finish and got this error:

Unable to complete install: 'internal error: libxenlight failed to create new domain '2012r2lab''

Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/", line 91, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/", line 1908, in do_install
File "/usr/share/virt-manager/virtinst/", line 426, in start_install
File "/usr/share/virt-manager/virtinst/", line 490, in _create_guest
dom = self.conn.createLinux(start_xml or final_xml, 0)
File "/usr/lib64/python2.7/site-packages/", line 3297, in createLinux
if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
libvirtError: internal error: libxenlight failed to create new domain '2012r2lab'

Oh, the guest is 2012R2 fullyvirtualized and the 2012R2 disc is in the drive. Any ideas?