react-native run-ios is not working

I was able to solve it by upgrading node.

brew upgrade node

type this in terminal.

There could be various reasons, in my case it was due to some of the libraries being used and I was able to figure out the solution by changing the Build Active Architecture Option.

Setting the target->Build Settings->Build Active Architecture Only option for both the app and Pods target (for both debug and Release) to Yes made it work with react native in command line while setting the above options to No made them work with Xcode.

Seems that you have a lot of missing libraries which are not downloaded for some reason, I recommend that you should delete all downloadable libs then start over again:

• delete node_modules/ folder
  • delete ios/Pods folder
  • delete ios/build folder
  • run: npm install
• run: cd ios; pod install; cd../
• run: react-native link

That's it