Description of problem:
tried to delete a former fedora 17 install after a failed fedup upgrade wrecked it. clicked begin install.

Version-Release number of selected component:
anaconda-19.30.13-1.fc19.x86_64

The following was filed automatically by anaconda:
anaconda 19.30.13-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/formats/__init__.py", line 327, in destroy
    raise FormatDestroyError(msg)
  File "/usr/lib/python2.7/site-packages/blivet/formats/luks.py", line 211, in destroy
    DeviceFormat.destroy(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 527, in execute
    self.format.destroy()
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 237, in processActions
    action.execute()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 310, in doIt
    self.devicetree.processActions()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 169, in turnOnFilesystems
    storage.doIt()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 140, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall)
  File "/usr/lib64/python2.7/threading.py", line 764, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 168, in run
    threading.Thread.run(self, *args, **kwargs)
FormatDestroyError: error wiping old signatures from /dev/sda2: 1

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-osimg-min --lang en_US.UTF-8
cmdline_file:   initrd=initrd0.img root=live:CDLABEL=Fedora-Live-Desktop-x86_64-19-1 rootfstype=auto ro rd.live.image quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0  BOOT_IMAGE=vmlinuz0 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.9.5-301.fc19.x86_64
other involved packages: python-blivet-0.17-1.fc19.noarch, python-libs-2.7.5-1.fc19.x86_64
product:        Fedora
release:        Fedora release 19 (Schrödinger’s Cat)
type:           anaconda
version:        19