---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
~/study/env3/local/lib/python3.5/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   2441             try:
-> 2442                 return self._engine.get_loc(key)
   2443             except KeyError:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5280)()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5126)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20523)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20477)()

KeyError: 'D'

During handling of the above exception, another exception occurred:

KeyError                                  Traceback (most recent call last)
<ipython-input-178-abe35435be3d> in <module>()
      5 enc = BinaryEncoder(handle_unknown='error')
      6 enc.fit(data)
----> 7 enc.transform(data)

~/study/env3/local/lib/python3.5/site-packages/category_encoders/binary.py in transform(self, X)
    155             return X
    156 
--> 157         X = self.ordinal_encoder.transform(X)
    158 
    159         X = self.binary(X, cols=self.cols)

~/study/env3/local/lib/python3.5/site-packages/category_encoders/ordinal.py in transform(self, X)
    173             cols=self.cols,
    174             impute_missing=self.impute_missing,
--> 175             handle_unknown=self.handle_unknown
    176         )
    177 

~/study/env3/local/lib/python3.5/site-packages/category_encoders/ordinal.py in ordinal_encoding(X_in, mapping, cols, impute_missing, handle_unknown)
    211                         X[switch.get('col')].fillna(-1, inplace=True)
    212                     elif handle_unknown == 'error':
--> 213                         if X[~X['D'].isin([str(x[1]) for x in switch.get('mapping')])].shape[0] > 0:
    214                             raise ValueError('Unexpected categories found in %s' % (switch.get('col'), ))
    215 

~/study/env3/local/lib/python3.5/site-packages/pandas/core/frame.py in __getitem__(self, key)
   1962             return self._getitem_multilevel(key)
   1963         else:
-> 1964             return self._getitem_column(key)
   1965 
   1966     def _getitem_column(self, key):

~/study/env3/local/lib/python3.5/site-packages/pandas/core/frame.py in _getitem_column(self, key)
   1969         # get column
   1970         if self.columns.is_unique:
-> 1971             return self._get_item_cache(key)
   1972 
   1973         # duplicate columns & possible reduce dimensionality

~/study/env3/local/lib/python3.5/site-packages/pandas/core/generic.py in _get_item_cache(self, item)
   1643         res = cache.get(item)
   1644         if res is None:
-> 1645             values = self._data.get(item)
   1646             res = self._box_item_values(item, values)
   1647             cache[item] = res

~/study/env3/local/lib/python3.5/site-packages/pandas/core/internals.py in get(self, item, fastpath)
   3588 
   3589             if not isnull(item):
-> 3590                 loc = self.items.get_loc(item)
   3591             else:
   3592                 indexer = np.arange(len(self.items))[isnull(self.items)]

~/study/env3/local/lib/python3.5/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   2442                 return self._engine.get_loc(key)
   2443             except KeyError:
-> 2444                 return self._engine.get_loc(self._maybe_cast_indexer(key))
   2445 
   2446         indexer = self.get_indexer([key], method=method, tolerance=tolerance)

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5280)()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5126)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20523)()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas/_libs/hashtable.c:20477)()

KeyError: 'D'