TLDR; brew install watchman When first time running Expo with React Native, you could get some errors with: 더보기 Expo Developer Tools is disconnected from Expo CLI. Use the expo start command to start the CLI again. 더보기 Logs for your project will appear below. Press Ctrl+C to exit. Error: EMFILE: too many open files, watch at EFSEvent.FSWatcher._handle.onchange(internal/fs/watchers.js:178:28) err..