react-native/docs/Troubleshooting.md

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

## Cmd-R does not reload the simulator
Enable iOS simulator's "Connect hardware keyboard" from menu Hardware > Keyboard menu. 

![Keyboard Menu](https://cloud.githubusercontent.com/assets/1388454/6863127/03837824-d409-11e4-9251-e05bd31d978f.png)


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
![red-screen](https://cloud.githubusercontent.com/assets/602176/6857442/63fd4f0a-d3cc-11e4-871f-875b0c784611.png)


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.