Github user bzz commented on the issue:
https://github.com/apache/zeppelin/pull/1301
Looks like candidate for `flaky-test` labeled JIRA issue in zeppelin-server:
```
Failed tests:
ZeppelinSparkClusterTest.zRunTest:204 expected:<FINISHED> but was:<ERROR>
Tests run: 65, Failures: 1, Errors: 0, Skipped: 0
```
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