How to fix "RuntimeError: revoscalepy function failed."

I try to run the example in https://docs.microsoft.com/vi-vn/sql/advanced-analytics/tutorials/sqldev-py3-explore-and-visualize-the-data?view=sql-server-2017

EXEC [dbo].[PyPlotMatplotlib]
GO

I got error, I don't know how to fix it.

Msg 39004, Level 16, State 20, Line 4
A 'Python' script error occurred during execution of 'sp_execute_external_script' with HRESULT 0x80004004.
Msg 39019, Level 16, State 2, Line 4

An external script error occurred:

Error in execution.  Check the output for more information.
Traceback (most recent call last):
  File "<string>", line 5, in <module>
  File "C:\PROGRA~1\MICROS~2\MSSQL1~1.MSS\MSSQL\EXTENS~1\MSSQLSERVER01\E92CD4AC-875A-4CB1-93CF-1F9271D30179\sqlindb.py", line 45, in transform
    rental_model = pickle.loads(py_model)
TypeError: a bytes-like object is required, not 'NoneType'

SqlSatelliteCall error: Error in execution.  Check the output for more information.
STDOUT message(s) from external script: 
SqlSatelliteCall function failed. Please see the console output for more information.
Traceback (most recent call last):
  File "C:\Program Files\Microsoft SQL Server\MSSQL14.MSSQLSERVER\PYTHON_SERVICES\lib\site-packages\revoscalepy\computecontext\RxInSqlServer.py", line 406, in rx_sql_satellite_call
    rx_native_call("SqlSatelliteCall", params)
  File "C:\Program Files\Microsoft SQL Server\MSSQL14.MSSQLSERVER\PYTHON_SERVICES\lib\site-packages\revoscalepy\RxSerializable.py", line 291, in rx_native_call
    ret = px_call(functionname, params)
RuntimeError: revoscalepy function failed.