react-native start 启动错误解决方法

ERROR Error watching file for changes: EMFILE
{"code":"EMFILE","errno":"EMFILE","syscall":"Error watching file for changes:","filename":null}
Error: Error watching file for changes: EMFILE
at exports._errnoException (util.js:1018:11)
at FSEvent.FSWatcher._handle.onchange (fs.js:1420:11)

brew install watchman