create-react-native-app won't start with yarn or npm

[jckuhl]

Description

I understand there's a bug with NPM5 and CRNA, so I installed it with Yarn. I installed my new app, went into it's folder and entered 'yarn start' just as the command prompted me to do. I got an error.

I don't know if it matters, but npm start does work for other react apps, it's only react-native that's giving me this problem.

Expected Behavior

Start the development build for a react app.

Observed Behavior

Jonathans-MBP:my-native-app jonathankuhl$ yarn start
yarn run v1.5.1
$ react-native-scripts start
16:43:13: Unable to start server
See https://git.io/v5vcn for more information, either install watchman or run the following snippet:
  sudo sysctl -w kern.maxfiles=5242880
  sudo sysctl -w kern.maxfilesperproc=524288

error An unexpected error occurred: "Command failed.
Exit code: 1
Command: sh
Arguments: -c react-native-scripts start
Directory: /Users/jonathankuhl/Documents/Programming/react/my-native-app
Output:
".
info If you think this is a bug, please open a bug report with the information provided in "/Users/jonathankuhl/Documents/Programming/react/my-native-app/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Environment

Please run these commands in the project folder and fill in their results:

• npm ls react-native-scripts:
  [email protected]
• npm ls react-native:
  [email protected]
• npm ls expo:
  [email protected]
• node -v:
  v9.6.0
• npm -v:
  5.6.0
• yarn --version:
  1.5.1
• watchman version:
  not installed

Also specify:

1. Operating system: Mac OS
2. Phone/emulator/simulator & version: Haven't gotten that far

[ide]

I'd recommend trying with Watchman installed. You can run brew install watchman to get it.

[jckuhl]

I didn't realize watchman was needed. My bad.

[brentvatne]

it's in the error message ;)

[iMerica]

This is a bug. See https://github.com/react-community/create-react-native-app/issues/639