Github user prabhjyotsingh commented on the issue:
https://github.com/apache/zeppelin/pull/1184
@zjffdu yes, we handle it(`"Session '10' not found."`) here.
https://github.com/apache/zeppelin/pull/1184/files#diff-6590a16671e62be8da95e793c364d739L305
and change this string to `Exception: Session not found, Livy server would
have restarted, or lost session.`
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