react-native/Troubleshooting.md at e47cfb6e3365b381253934a30c543276430ca350

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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

Debugging in Chrome hangs and/or does not work well

It is possible that one of your Chrome extensions is interacting in unexpected ways with the debugger. If you are having this issue, try disabling all of your extensions and re-enabling them one-by-one until you find the problematic extension.

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