Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1307
Thanks @minahlee, the CI fail should be irrelevant, it is due to network
issue.
```
[INFO] âââ [email protected]
[ERROR] npm ERR! Linux 3.13.0-40-generic
[ERROR] npm ERR! argv
"/home/travis/build/apache/zeppelin/zeppelin-web/node/node"
"/home/travis/build/apache/zeppelin/zeppelin-web/node/node_modules/npm/bin/npm-cli.js"
"install" "--color=false"
[ERROR] npm ERR! node v0.12.13
[ERROR] npm ERR! npm v2.15.0
[ERROR]
[ERROR] npm ERR! Callback called more than once.
[ERROR] npm ERR!
[ERROR] npm ERR! If you need help, you may report this error at:
[ERROR] npm ERR! <https://github.com/npm/npm/issues>
[ERROR]
[ERROR] npm ERR! Please include the following file with any support request:
[ERROR] npm ERR!
/home/travis/build/apache/zeppelin/zeppelin-web/npm-debug.log
```
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