The following was filed automatically by anaconda:
anaconda 15.20 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/livecd.py", line 341, in getMinimumSizeMB
    return self.anaconda.storage.liveImage.format.size
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/__init__.py", line 1027, in sanityCheck
    root.size < self.anaconda.backend.getMinimumSizeMB("/")):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/partitioning.py", line 259, in doAutoPartition
    (errors, warnings) = anaconda.storage.sanityCheck()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/dispatch.py", line 211, in moveStep
    rc = stepFunc(self.anaconda)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/dispatch.py", line 130, in gotoNext
    self.moveStep()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/gui.py", line 1346, in setScreen
    self.anaconda.dispatch.gotoNext()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/gui.py", line 1258, in nextClicked
    self.setScreen ()
AttributeError: 'NoneType' object has no attribute 'format'