Github user marevol commented on the pull request:
https://github.com/apache/incubator-predictionio/commit/d78b3cbe912cf57e2f0278e407a0d6432bd12849#commitcomment-21280327
@pferrel I think PIO discards the stacktrace and the root cause is unclear
in the log message.
Could you merge https://github.com/apache/incubator-predictionio/pull/360
to your environment?
and then run pio status, we will be able to check the cause in pio.log file.
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