Traceback (most recent call last):


 "/usr/local/lib/python3.6/site-packages/superset/views/base.py", line 124, in wraps

return f(self, *args, **kwargs)


 "/usr/local/lib/python3.6/site-packages/superset/utils/decorators.py", line 70, in wrapper

return f(*args, **kwargs)


 "/usr/local/lib/python3.6/site-packages/superset/views/core.py", line 717, in explore_json

viz_obj, csv=csv, query=query, results=results, samples=samples


 "/usr/local/lib/python3.6/site-packages/superset/views/core.py", line 639, in generate_json

payload = viz_obj.get_payload()


 "/usr/local/lib/python3.6/site-packages/superset/viz.py", line 406, in get_payload

payload["data"] = self.get_data(df)


 "/usr/local/lib/python3.6/site-packages/superset/viz.py", line 2874, in get_data

levels = self.levels_for("agg_sum", groups, df)


 "/usr/local/lib/python3.6/site-packages/superset/viz.py", line 2756, in levels_for

agg_df = df.groupby(groups[:i]) if i else df


 "/usr/local/lib/python3.6/site-packages/pandas/core/generic.py", line 7894, in groupby

**kwargs


 "/usr/local/lib/python3.6/site-packages/pandas/core/groupby/groupby.py", line 2522, in groupby

return klass(obj, by, **kwds)


 "/usr/local/lib/python3.6/site-packages/pandas/core/groupby/groupby.py", line 391, in __init__

mutated=self.mutated,


 "/usr/local/lib/python3.6/site-packages/pandas/core/groupby/grouper.py", line 621, in _get_grouper

raise KeyError(gpr)
KeyError: 'subcategory'

Traceback (most recent call last):


 "/home/eward/se2/sympy/core/evalf.py", line 1308, in evalf

rf = evalf_table[x.func]
KeyError: polygamma
