Github user AhyoungRyu commented on the issue:
https://github.com/apache/zeppelin/pull/1241
@zjffdu I'm not sure, your issue is related with [this
issue](https://github.com/bundler/bundler/issues/4065#issuecomment-149596385),
could you try
```
gem uninstall bundler
sudo gem install bundler
```
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