react-native/Troubleshooting.md at c8373d2ad66192a42010f40b2e58bd157665c644

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id	title	layout	category	permalink
troubleshooting	Troubleshooting	docs	Quick Start	docs/troubleshooting.html

Cmd-R does not reload the simulator

Enable iOS simulator's "Connect hardware keyboard" from menu Hardware > Keyboard menu.

If you are using a non-QWERTY/AZERTY keyboard layout you can use the Hardware > Shake Gesture to bring up the dev menu and click "Refresh"

Port already in use red-screen

Something is probably already running on port 8081. You can either kill it or try to change which port the packager is listening to.

Kill process on port 8081

$ sudo lsof -n -i4TCP:8081 | grep LISTEN

then

$ kill -9 <cma process id>

Change the port in Xcode

Edit AppDelegate.m to use a different port.

  // OPTION 1
  // Load from development server. Start the server from the repository root:
  //
  // $ npm start
  //
  // To run on device, change `localhost` to the IP address of your computer, and make sure your computer and
  // iOS device are on the same Wi-Fi network.
  jsCodeLocation = [NSURL URLWithString:@"http://localhost:9381/index.ios.bundle"];

Watchman took too long to load

Permission settings prevent Watchman from loading. A recent update solves this, get a HEAD install of Watchman if you are experiencing this error.

brew uninstall watchman
brew install --HEAD watchman

NPM locking error

If in the react-native init <project> phase you saw npm fail with "npm WARN locking Error: EACCES" then try the following:

sudo chown -R $USER ~/.npm
sudo chown -R $USER /usr/local/lib/node_modules

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