Github user jongyoul commented on the issue:
https://github.com/apache/zeppelin/pull/2884
I've found a bug in this PR. if the value is not a string, it occurs error.
e.g.
```
"zeppelin.python": {
"name": "zeppelin.python",
"value": "python",
"type": "string"
},
```
our properties look like this.---
