Github user zjffdu commented on the issue:
    Actually we already import this when initialize spark interpreter.
    The problem is that we would still hit this kind of error when run the 
tutorial note of bank data. This is due to an issue scala 2.10 
(SI-6649)[]. This error doesn't' 
happen before just because we split code into lines and interpret it line by 
line. But as I mentioned before, interpret it line by line is not a correct 
    The good news is that it only affect scala 2.10.


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