Unable to complete install: 'internal error: process exited while connecting to monitor: 2018-05-30T19:36:02.233520Z qemu-system-x86_64: -drive file=/var/lib/libvirt/qemu/nvram/win10_VARS.fd,if=pflash,format=raw,unit=1: oversized backing file, pflash segments cannot be mapped under 00000000ff800000'

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/create.py", line 2553, in _do_async_install
    guest.start_install(meter=meter)
  File "/usr/share/virt-manager/virtinst/guest.py", line 498, in start_install
    doboot, transient)
  File "/usr/share/virt-manager/virtinst/guest.py", line 434, in _create_guest
    domain = self.conn.createXML(install_xml or final_xml, 0)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3659, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)
libvirtError: internal error: process exited while connecting to monitor: 2018-05-30T19:36:02.233520Z qemu-system-x86_64: -drive file=/var/lib/libvirt/qemu/nvram/win10_VARS.fd,if=pflash,format=raw,unit=1: oversized backing file, pflash segments cannot be mapped under 00000000ff800000