html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/859#issuecomment-271536552,https://api.github.com/repos/pydata/xarray/issues/859,271536552,MDEyOklzc3VlQ29tbWVudDI3MTUzNjU1Mg==,10050469,2017-01-10T10:11:58Z,2017-01-10T10:11:58Z,MEMBER,"This just happened to me too:

```python
In [1]: import xarray as xr
In [2]: ds = xr.open_dataset('ERA-Int-Monthly-UVSLP.nc')
In [3]: ds = ds.rolling()
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-3-16ff572cfc35> in <module>()
----> 1 ds = ds.rolling()

/home/mowglie/Documents/git/xarray/xarray/core/common.py in rolling(self, min_periods, center, **windows)
    507         """"""
    508 
--> 509         return self.rolling_cls(self, min_periods=min_periods,
    510                                 center=center, **windows)
    511 

/home/mowglie/Documents/git/xarray/xarray/core/common.py in __getattr__(self, name)
    224                     return source[name]
    225         raise AttributeError(""%r object has no attribute %r"" %
--> 226                              (type(self).__name__, name))
    227 
    228     def __setattr__(self, name, value):

AttributeError: 'Dataset' object has no attribute 'rolling_cls'
```

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