在 Ubuntu 17.10 上 npm 启动后，react-native watchman 错误。

Question

我正在尝试在 Ubuntu 上启动 React-native 项目，node、npm 都是最新版本。根据文档我已经安装了所有官方的create-react-native-app及其依赖项。

这是 npm 启动后的输出屏幕

gd@gd:~/Desktop$ cd testing7/
gd@gd:~/Desktop/testing7$ npm start

> testing7@0.1.0 start /home/gd/Desktop/testing7
> react-native-scripts start

10:01:07: Starting packager...
***ERROR STARTING PACKAGER***
Starting React Native packager...
Scanning folders for symlinks in /home/gd/Desktop/testing7/node_modules (44ms)
Loading dependency graph.



jest-haste-map: Watchman crawl failed. Retrying once with node crawler.
  Usually this happens when watchman isn't running. Create an empty `.watchmanconfig` file in your project's root folder or initialize a git or hg repository in your project.
  Error: Watchman error: A non-recoverable condition has triggered.  Watchman needs your help!
The triggering condition was at timestamp=1523075484: opendir(/home/gd/Desktop/testing7/node_modules/metro/node_modules/ansi-regex) -> The user limit on the total number of inotify watches was reached; increase the fs.inotify.max_user_watches sysctl
All requests will continue to fail with this message until you resolve
the underlying problem.  You will find more information on fixing this at
https://facebook.github.io/watchman/docs/troubleshooting.html#poison-opendir. Make sure watchman is running for this project. See https://facebook.github.io/watchman/docs/troubleshooting.html.

Answer 1

尝试这两个命令

`watchman watch-del-all`
`watchman shutdown-server`