Traceback (most recent call last):


 "/home/nazmul/WorkDir/ECORR/ARIMA.py", line 3, in <module>

from statsmodels.tsa.arima_model import ARIMA


 "/home/nazmul/WorkDir/ECORR/statsmodels/tsa/arima_model.py", line 30, in <module>

from statsmodels.tsa.ar_model import AR


 "/home/nazmul/WorkDir/ECORR/statsmodels/tsa/ar_model.py", line 601, in <module>

class ARResults(tsbase.TimeSeriesModelResults):


 "/home/nazmul/WorkDir/ECORR/statsmodels/tsa/ar_model.py", line 804, in ARResults

preddoc = AR.predict.__doc__.split('\n')
AttributeError: 'NoneType' object has no attribute 'split'

Traceback (most recent call last):


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 353, in _wrapped

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 493, in inner

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/scheduler/graph.py", line 633, in prepare_graph

self._target_tileable_datas + fetch_tileables, tileable_graph)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 399, in _wrapped

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 493, in inner

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 350, in build

tileables, tileable_graph=tileable_graph)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 399, in _wrapped

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 493, in inner

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 263, in build

self._on_tile_failure(tileable_data.op, exc_info)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 302, in inner

raise exc_info[1].with_traceback(exc_info[2]) from None


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 243, in build

tiled = self._tile(tileable_data, tileable_graph)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 338, in _tile

return super()._tile(tileable_data, tileable_graph)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 203, in _tile

tds = on_tile(tileable_data.op.outputs, tds)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/scheduler/graph.py", line 615, in on_tile

return self.context.wraps(handler.dispatch)(first.op)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/context.py", line 69, in h

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/utils.py", line 399, in _wrapped

return func(*args, **kwargs)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/tiles.py", line 119, in dispatch

tiled = op_cls.tile(op)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/dataframe/groupby/aggregation.py", line 481, in tile

return cls._tile_with_tree(op)


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/dataframe/groupby/aggregation.py", line 412, in _tile_with_tree

index = out_df.index_value.to_pandas()


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/dataframe/core.py", line 283, in to_pandas

return self._index_value.to_pandas()


 "/Users/hekaisheng/Documents/mars_dev/mars/mars/dataframe/core.py", line 197, in to_pandas

sortorder=self._sortorder, names=self._names)
AttributeError: _sortorder
