Github user spektom commented on the issue:
https://github.com/apache/zeppelin/pull/1447
@gss2002 are you using latest code from the branch? I can't find
org.apache.zeppelin.livy.LivyHelper.interpretInput(LivyHelper.java:189)
invocation at
org.apache.zeppelin.livy.LivySparkInterpreter.interpret(LivySparkInterpreter.java:106)
as it's shown in your stack trace.
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