Error when trying to download hist data

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What steps will reproduce the problem?
1. running the reference_python file with param : reqHistorialData
2.
3.

What is the expected output? What do you see instead?
Expect historial data but get :
errorMsg:Request Historical Data Sending Error - 'tuple' object has no 
attribute 'getBytes'

What version of the product are you using? On what operating system?
Py 2.6, Win XP, latest TWS 918.9b from Aug 4, 2011

Please provide any additional information below.

Original issue reported on code.google.com by ingokro...@gmail.com on 1 Sep 2011 at 4:55