Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1688
CI test failed with
```
Results :
Tests in error:
ParagraphActionsIT.testRemoveButton:155->AbstractZeppelinIT.clickAndWait:131 »
ElementNotVisible
ParagraphActionsIT.testMoveUpAndDown:200->AbstractZeppelinIT.clickAndWait:131
» ElementNotVisible
ParagraphActionsIT.testCreateNewButton:85 » ElementNotVisible Element is
not c...
ZeppelinIT.testAngularDisplay:157->AbstractZeppelinIT.waitForText:84 »
StaleElementReference
Tests run: 18, Failures: 0, Errors: 4, Skipped: 0
```
screenshot from ci server

I don't think this PR caused the error but to make sure, could you trigger
CI build again?
You can add commit or close/open this pullrequest to trigger CI build.
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