The following was filed automatically by anaconda:
anaconda 15.31 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/posixpath.py", line 112, in basename
    i = p.rfind('/') + 1
  File "/usr/lib/python2.7/site-packages/pyanaconda/storage/formats/__init__.py", line 422, in majorminor
    device = dm_node_from_name(os.path.basename(self.device))
  File "/usr/lib/python2.7/site-packages/pyanaconda/storage/formats/__init__.py", line 271, in cacheMajorminor
    self.majorminor # this does the caching
  File "/usr/lib/python2.7/site-packages/pyanaconda/storage/devices.py", line 700, in _preTeardown
    self.format.cacheMajorminor()
  File "/usr/lib/python2.7/site-packages/pyanaconda/storage/devices.py", line 714, in teardown
    if not self._preTeardown(recursive=recursive):
  File "/usr/lib/python2.7/site-packages/pyanaconda/storage/devicetree.py", line 1868, in teardownAll
    device.teardown(recursive=True)
  File "/usr/lib/python2.7/site-packages/pyanaconda/packages.py", line 103, in turnOnFilesystems
    anaconda.storage.devicetree.teardownAll()
  File "/usr/lib/python2.7/site-packages/pyanaconda/dispatch.py", line 211, in moveStep
    rc = stepFunc(self.anaconda)
  File "/usr/lib/python2.7/site-packages/pyanaconda/dispatch.py", line 130, in gotoNext
    self.moveStep()
  File "/usr/lib/python2.7/site-packages/pyanaconda/gui.py", line 1257, in nextClicked
    self.anaconda.dispatch.gotoNext()
AttributeError: 'NoneType' object has no attribute 'rfind'