KVM domain instance fails to start when a SCSI disk is added.

  Error starting domain internal error process exited while
  connecting to monitor
  char device redirected to /dev/pts/0 qemu-kvm
  -device lsi,id=scsi0,bus=pci.0,addr=0x7
  Parameter 'driver' expects a driver name
  Try with argument '?' for a list.
  Details
   Traceback (most recent call last)
   File "/usr/share/virt-manager/virtManager/engine.py", line 878,
   in run_domain vm.startup()
   File "/usr/share/virt-manager/virtManager/domain.py", line 1313,
   in startup self._backend.create()
   File "/usr/lib64/python2.6/site-packages/libvirt.py", line 333,
   in create if ret == -1
   raise libvirtError ('virDomainCreate() failed', dom=self)
   libvirtError  internal error process exited while connecting to
   monitor
   char device redirected to /dev/pts/0
   qemu-kvm  -device lsi,id=scsi0,bus=pci.0,addr=0x7
   Parameter 'driver' expects a driver name
   Try with argument '?' for a list.