Github user dszeto commented on the issue:
https://github.com/apache/incubator-predictionio/issues/280
Thanks for reporting. This is fixed in the latest codebase. Despite this
exception, all `pio` commands will still succeed at the end.
By the way, please subscribe and post to
[email protected] for further questions (instructions @
http://predictionio.incubator.apache.org/support/).
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