Предложения для SpecificationError: вложенное переименование не поддерживается

Question

Код: #create RMF Моделирование баллов для каждого клиента Значения, хранящиеся в кадре данных RFMscore

RFMscore = sales_data.groupby('CustomerID').agg({'InvoiceDate': lambda x: (Last_date - x.max()).days, 
'InvoiceNo': lambda x: len(x), 'TotalAmount': lambda x: x.sum()})

Ошибка:

<ipython-input-23-b3e30f63aebe> in <module>()
      4 #create RMF Modelling scores for each customer Values stored in dataframe RFMscore
      5 
----> 6 RFMscore = sales_data.groupby('CustomerID').agg({'InvoiceDate': lambda x: (Last_date - x.max()).days, 'InvoiceNo': lambda x: len(x), 'TotalAmount': lambda x: x.sum()})
      7 
      8 #convert invoicedate to int so that mathematical operations can be done easily

1 frames
/usr/local/lib/python3.6/dist-packages/pandas/core/base.py in _aggregate(self, arg, *args, **kwargs)
    355                     obj.columns.intersection(keys)
    356                 ) != len(keys):
--> 357                     raise SpecificationError("nested renamer is not supported")
    358 
    359             from pandas.core.reshape.concat import concat

SpecificationError: nested renamer is not supported```