tail exception

tail exception

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/generic.pyc in tail(self, n)
   1570         if abs(n) > l:
   1571             n = l if n > 0 else -l
-> 1572         return self.iloc[-n:]
   1573 
   1574     #----------------------------------------------------------------------

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/indexing.pyc in __getitem__(self, key)
   1018             return self._getitem_tuple(key)
   1019         else:
-> 1020             return self._getitem_axis(key, axis=0)
   1021 
   1022     def _getitem_axis(self, key, axis=0):

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/indexing.pyc in _getitem_axis(self, key, axis)
   1208         if isinstance(key, slice):
   1209             self._has_valid_type(key, axis)
-> 1210             return self._get_slice_axis(key, axis=axis)
   1211 
   1212         elif com._is_bool_indexer(key):

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/indexing.pyc in _get_slice_axis(self, slice_obj, axis)
   1200         if isinstance(slice_obj, slice):
   1201             return self._slice(slice_obj, axis=axis, raise_on_error=True,
-> 1202                                typ='iloc')
   1203         else:
   1204             return self.obj.take(slice_obj, axis=axis, convert=False)

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/indexing.pyc in _slice(self, obj, axis, raise_on_error, typ)
     73     def _slice(self, obj, axis=0, raise_on_error=False, typ=None):
     74         return self.obj._slice(obj, axis=axis, raise_on_error=raise_on_error,
---> 75                                typ=typ)
     76 
     77     def __setitem__(self, key, value):

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/frame.pyc in _slice(self, slobj, axis, raise_on_error, typ)
   1834         axis = self._get_block_manager_axis(axis)
   1835         new_data = self._data.get_slice(
-> 1836             slobj, axis=axis, raise_on_error=raise_on_error)
   1837         return self._constructor(new_data)
   1838 

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/internals.pyc in get_slice(self, slobj, axis, raise_on_error)
   2514 
   2515         if raise_on_error:
-> 2516             _check_slice_bounds(slobj, new_axes[axis])
   2517 
   2518         new_axes[axis] = new_axes[axis][slobj]

/usr/anaconda/lib/python2.7/site-packages/pandas-0.13.0_16_g2c8a8ef-py2.7-linux-x86_64.egg/pandas/core/indexing.pyc in _check_slice_bounds(slobj, values)
   1521     if start is not None:
   1522         if start < -l or start > l - 1:
-> 1523             raise IndexError("out-of-bounds on slice (start)")
   1524     stop = slobj.stop
   1525     if stop is not None:

IndexError: out-of-bounds on slice (start)