ETIMEOUT error when package zeppelin-web

When build zeppelin project, the following error occurs:
```
[INFO]
[INFO] — frontend-maven-plugin:1.3:yarn (yarn install) @ zeppelin-web —
[INFO] Running 'yarn install --no-lockfile --network-concurrency 1' in /root/software/zeppelin-0.7.2/zeppelin-web
[INFO] yarn install v1.0.2
[INFO] [1/5] Validating package.json...
[INFO] [2/5] Resolving packages...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[ERROR] error An unexpected error occurred: "https://registry.yarnpkg.com/clean-css: ETIMEDOUT".
[INFO] info If you think this is a bug, please open a bug report with the information provided in "/root/software/zeppelin-0.7.2/zeppelin-web/yarn-error.log".
[INFO] info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning minimatch@0.3.0: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[WARNING] warning There appears to be trouble with your network connection. Retrying...
[ERROR] Error: https://registry.yarnpkg.com/async: ETIMEDOUT
[ERROR] at Timeout._onTimeout (/root/software/zeppelin-0.7.2/zeppelin-web/node/yarn/dist/lib/cli.js:118034:19)
[ERROR] at ontimeout (timers.js:365:14)
[ERROR] at Timeout._onTimeout (/root/software/zeppelin-0.7.2/zeppelin-web/node/yarn/dist/lib/cli.js:118034:19)
[ERROR] at ontimeout (timers.js:365:14)
[ERROR] at tryOnTimeout (timers.js:237:5)
[ERROR] at Timer.listOnTimeout (timers.js:207:5)
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Zeppelin ........................................... SUCCESS [ 2.181 s]
[INFO] Zeppelin: Interpreter .............................. SUCCESS [ 2.417 s]
[INFO] Zeppelin: Zengine .................................. SUCCESS [ 2.840 s]
[INFO] Zeppelin: Display system apis ...................... SUCCESS [ 0.644 s]
```