Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/sphinx/ext/autodoc.py", line 385, in import_object
__import__(self.modname)ImportError: No module named letsencrypt_compatibility_test.interfaces
Traceback (most recent call last):

 "/home/mtk/bug.py", line 13, in <module>
print df.values

 "/Users/mtk/Source/pandas/pandas/core/frame.py", line 1779, in as_matrix
return self._data.as_matrix(columns).T

 "/Users/mtk/Source/pandas/pandas/core/internals.py", line 1513, in as_matrix
mat = self._interleave(self.items)

 "/Users/mtk/Source/pandas/pandas/core/internals.py", line 1549, in _interleave
raise AssertionError('Some items were not contained in blocks')AssertionError: Some items were not contained in blocks