Github user AhyoungRyu commented on the issue:
https://github.com/apache/zeppelin/pull/2042
@soralee Thanks for digging it out! Since it's because of the cache in
travis, someone who contributed to Zeppelin for the first time didn't went
through this issue and saw green light. I think we need to guide contributors
for a while to clear their cache as you did.
@1ambda Could you try like this to make sure?
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