Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1924
@astroshim following test failure might related. Could you check?
```
Tests run: 5, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 19.978 sec
<<< FAILURE! - in org.apache.zeppelin.spark.PySparkInterpreterMatplotlibTest
testAngular(org.apache.zeppelin.spark.PySparkInterpreterMatplotlibTest)
Time elapsed: 0.252 sec <<< ERROR!
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.LinkedList.checkElementIndex(LinkedList.java:553)
at java.util.LinkedList.get(LinkedList.java:474)
at
org.apache.zeppelin.spark.PySparkInterpreterMatplotlibTest.testAngular(PySparkInterpreterMatplotlibTest.java:229)
testNoClose(org.apache.zeppelin.spark.PySparkInterpreterMatplotlibTest)
Time elapsed: 0.421 sec <<< ERROR!
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.LinkedList.checkElementIndex(LinkedList.java:553)
at java.util.LinkedList.get(LinkedList.java:474)
at
org.apache.zeppelin.spark.PySparkInterpreterMatplotlibTest.testNoClose(PySparkInterpreterMatplotlibTest.java:216)
```
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