---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-24-2547282d00f5> in <module>()
----> 1 df['foo'].groupby(level=0, group_keys=False).rolling(7, min_periods=1, center=True).agg(['mean', 'count'])

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/window.py in aggregate(self, arg, *args, **kwargs)
   1186         klass='Series/DataFrame'))
   1187     def aggregate(self, arg, *args, **kwargs):
-> 1188         return super(Rolling, self).aggregate(arg, *args, **kwargs)
   1189
   1190     agg = aggregate

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/window.py in aggregate(self, arg, *args, **kwargs)
    331
    332     def aggregate(self, arg, *args, **kwargs):
--> 333         result, how = self._aggregate(arg, *args, **kwargs)
    334         if result is None:
    335             return self.apply(arg, args=args, kwargs=kwargs)

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/base.py in _aggregate(self, arg, *args, **kwargs)
    632             return self._aggregate_multiple_funcs(arg,
    633                                                   _level=_level,
--> 634                                                   _axis=_axis), None
    635         else:
    636             result = None

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/base.py in _aggregate_multiple_funcs(self, arg, _level, _axis)
    661             for a in arg:
    662                 try:
--> 663                     colg = self._gotitem(obj.name, ndim=1, subset=obj)
    664                     results.append(colg.aggregate(a))
    665

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/window.py in _gotitem(self, key, ndim, subset)
   1307             self._groupby.obj = self._groupby.obj.set_index(self._on)
   1308             self.on = None
-> 1309         return super(RollingGroupby, self)._gotitem(key, ndim, subset=subset)
   1310
   1311     def _validate_monotonic(self):

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/base.py in _gotitem(self, key, ndim, subset)
    769                        for attr in self._attributes])
    770         self = self.__class__(subset,
--> 771                               groupby=self._groupby[key],
    772                               parent=self,
    773                               **kwargs)

~/work/virtualenv/python3/lib/python3.6/site-packages/pandas/core/base.py in __getitem__(self, key)
    352         else:
    353             if key not in self.obj:
--> 354                 raise KeyError("Column not found: %s" % key)
    355             return self._gotitem(key, ndim=1)
    356

KeyError: 'Column not found: foo'