Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/2327
CI failed but irrelevant.
- https://travis-ci.org/1ambda/zeppelin/jobs/230590633
Found the same errors in 4 different PRs
- https://travis-ci.org/1ambda/zeppelin/jobs/230590633
- https://travis-ci.org/1ambda/zeppelin/jobs/230549655
- https://travis-ci.org/1ambda/zeppelin/jobs/230235896
- https://travis-ci.org/1ambda/zeppelin/jobs/230215694
might be related with https://github.com/apache/zeppelin/pull/2300
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