React Native - FBReactNativeSpec Command PhaseScriptExecution failed with a nonzero exit code

I managed to get rid of the FBReactNativeSpec error by editing the Project settings.

Try the following:

1. In Xcode select your app's project and then select the target.

2. In Terminal enter the following command to find out the path of your node installation:

which node

This should give you a path. Something like:

/Users/thomashuber/.nvm/versions/node/v16.14.0/bin/node

3. Copy this path.

4. In Xcode with the target selected click on Build Phases and open Bundle React Native code and images

5. Replace NODE_BINARY=node. Instead of node enter the path that you have copied so that it is something like this NODE_BINARY=/Users/thomashuber/.nvm/versions/node/v16.14.0/bin/node

It seems like nvm is messing with the build process and if you shut down your computer or did a recent upgrade to node or nvm something in the cache folder gets reset and the build fails. Nvm is the culprit and the code surrounding it in the react native node_modules/react-native/scripts/find-node.sh script related to nvm. Following this advice: https://stackoverflow.com/a/70104375/5927929 worked for me with a small change.

My specs: Mac intel chip RN 0.68.2 nvm (0.33.11) && node (v18.3.0) install

Steps:

1. nvm unalias default
2. nvm alias default node
3. Build in xcode...done

Ok, worth trying this.

2 different solutions :

1: As soon as we get this error message:

Always scroll up & read the issue if written in that log file. Any issues like syntax error or issue related to your js code (like multiple imports in your js files or if you had forgot to import something). If yes, you can fix that first & re build it.

In my case I had multiple imports of one of the RN components.

if not

2: got to 'Keychain access' in your mac, lock & unlock login and re build it, this may help you.

And make sure to 'cd ios' && 'pod install' if you have forgot to do it after installing any of the npm package.

1. Determine what your node binary is:

   $ which node /opt/homebrew/bin/node

2. Add a fixer function in your Podfile:

   def fix_fb_react_native_spec(installer) installer.pods_project.targets.each do |target| if target.name == 'FBReactNativeSpec' target.build_configurations.each do |config| if config.name == 'Debug' or config.name == 'Release' config.build_settings['NODE_BINARY'] = '/opt/homebrew/bin/node' end end end end end

3. In your postinstall, add fix_fb_react_native_spec(installer) like so:

   post_install do |installer| react_native_post_install(installer) fix_fb_react_native_spec(installer) end

4. Pod install

5. Rebuild (ideally with a clean build)

In my case this error raising due to node path is not set in PATH Variables. Try to run below command it will set missing node path in PATH variable and it resolve the error.

sudo ln -s $(which node) /usr/local/bin/node

https://reactnative.dev/docs/new-architecture-troubleshooting#:~:text=Command%20PhaseScriptExecution%20failed%20with%20a,libraries%20(FBReactNativeSpec%2C%20rncore).

In my case:

• M1 chip
• MacOS Monterey
• Xcode Version 13.2.1
• node v16.6.0
• react-native 0.69

I was trying to build the iOS app via terminal under Rossetta. Once I tried to use native M1 terminal - it worked well.

Go to your applications, right click on the app, get info, check OFF Open using Rossetta