Github user lizhenhuan commented on the issue:
https://github.com/apache/zeppelin/pull/3007
There are two protobuf.version variable in pom.xml
First one in spark/pom.xml is 2.5.0
Second on in spark-dependencies/pom.xml is 2.4.1.
I also install python protobuf by run command : pip install protobuf
python version 2.7.5---
