Github user ejono commented on the issue:
https://github.com/apache/zeppelin/pull/1880
@zjffdu, I did see your follow-up commit but was already testing from that
commit. I'm not sure what was wrong. Wasn't the CI (which hit the same exact
error) also building from that commit? If so, it seems that there is still a
problem, as CI hasn't passed yet, right?
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