Description of problem:
Reformatted my disk with an empty luks+ext4 partition with gnome-disks by hand first, then attempted to reclaim all of the space with anaconda and hit this exception during the install process.

Version-Release number of selected component:
anaconda-20.25.6-1.fc20.x86_64

The following was filed automatically by anaconda:
anaconda 20.25.6-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/formats/luks.py", line 164, in setup
    raise LUKSError("luks device not configured")
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 841, in setupParents
    _format.setup()
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 704, in _preSetup
    self.setupParents(orig=orig)
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 715, in setup
    if not self._preSetup(orig=orig):
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 526, in execute
    self.device.setup(orig=True)
  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 142, 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)
LUKSError: luks device not configured

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base --lang en_US.UTF-8
cmdline_file:   initrd=initrd0.img root=live:CDLABEL=LIVE rootfstype=vfat ro rd.live.image quiet  rhgb rd.luks=0 rd.md=0 rd.dm=0  BOOT_IMAGE=vmlinuz0 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.11.7-300.fc20.x86_64
other involved packages: python-libs-2.7.5-8.fc20.x86_64, python-blivet-0.23.4-1.fc20.noarch
product:        Fedora
release:        Fedora release 20 (Heisenbug)
type:           anaconda
version:        20

Potential duplicate: bug 983099