我try 使用react native start运行react native cli项目，但metro bundler失败，原因如下:
events.js 187
throw er; //Unhandled 'error' event
Error: EMFILE: too many open files, watch
Emitted 'error' event on NodeWatcher isntance at:
at NodeWatcher: checkedEmitError (.../react-native-project/node_modules/sane/src/node_watcher.js:143:12)
at FSWatcher.emit (events.js:210:5)
at FSEvent.FSWatcher:_handle onchange (internal/fs/watchers.js:129:12) {
errno: -24,
syscall: 'watch',
code : 'EMFILE',
filename: null
)
Process terminated. Press <enter> to close the window