run the notebook from top and see this error in SPATIAL REPRESENTATION section

[founderchiu]

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AttributeError Traceback (most recent call last)
in
31 pad_entity = pad_entity.union(df_well.entity[n]) #Pad entity equalt union if subsequent
32 pad_index = df_pad[df_pad.id == df_well.pad_id[n]].index[0]
---> 33 df_pad.set_value(pad_index, 'entity', pad_entity) #df_pad is updated with latest entity
34
35 #Add len_tot, stage_tot and water_tot to df_pad