React-native: Something went wrong while linking. Error: Cannot read property 'UIAppFonts' of null

[montooner]

Environment

  React Native Environment Info:
    System:
      OS: Linux 3.10 CentOS Linux 7 (Core)
      CPU: x64 Intel(R) Core(TM) i5-7600K CPU @ 3.80GHz
      Memory: 903.03 MB / 1.80 GB
      Shell: 4.2.46 - /bin/bash
    Binaries:
      Node: 8.12.0 - /opt/node/bin/node
      Yarn: 1.10.1 - /opt/node/bin/yarn
      npm: 6.4.1 - /opt/node/bin/npm
    SDKs:
      Android SDK:
        Build Tools: 27.0.3
        API Levels: 27
    npmPackages:
      react: ^16.5.1 => 16.5.1
      react-native: 0.57.0-rc.4 => 0.57.0-rc.4
    npmGlobalPackages:
      react-native-cli: 2.0.1

Trigger

I get this error when running react-native link native-base. I'm trying this package out for the the first time. native-base is set to "native-base": "^2.8.0".

Full error

[vagrant@myapp app]$ react-native link native-base
rnpm-install info Linking assets to ios project
rnpm-install WARN ERRGROUP Group 'Resources' does not exist in your Xcode project. We have created it automatically for you.
rnpm-install ERR! Something went wrong while linking. Error: Cannot read property 'UIAppFonts' of null
Please file an issue here: https://github.com/facebook/react-native/issues

Cannot read property 'UIAppFonts' of null

TypeError: Cannot read property 'UIAppFonts' of null
    at Object.linkAssetsIOS [as copyAssets] (/home/vagrant/app/node_modules/react-native/local-cli/link/ios/copyAssets.js:45:31)
    at Object.keys.forEach.platform (/home/vagrant/app/node_modules/react-native/local-cli/link/link.js:104:16)
    at Array.forEach (<anonymous>)
    at linkAssets (/home/vagrant/app/node_modules/react-native/local-cli/link/link.js:94:32)
    at tasks.push (/home/vagrant/app/node_modules/react-native/local-cli/link/link.js:171:20)
    at <anonymous> 

Similar reports around the web

• Cannot read property 'UIAppFonts' of null while running react-native link after installing native-base - issue in 'react-native' (2018-08-29)
• Throws error on Android - issue in 'react-native-vector-icons' (2018-07-27)
• Error: Cannot read property 'UIAppFonts' of null - issue reported on SO (2017-01-23, older issue)

Additional troubleshooting

• It was suggested on SO and in react-native-vector-icons issues that this could be because Info.plist was deleted. It's present in my application.

Reproducible Demo

I don't have an easily shared demo, unfortunately.

[montooner]

Hmm, I can't reproduce on a clean project. native-base links properly.

My guess is that my ios files aren't correct somehow. Is there a way I can check or restore them?

[montooner]

Ah, I was able to fix it using the above idea:

yarn upgrade react-native@^0.57.1 # Not sure if necessary; I just did it
react-native upgrade # Regenerates ios files
react-native link native-base # Works now

Please feel free to close.

[jamonholmgren]

I had this problem and in my case it was because I had renamed the project but forgotten a few folders.