RNFirebase core module was not found natively on ios – Fix

This issue happens in react-native-firebase for a various reasons.

First thing you have to do is check

• Firebase/Core is in your pods.
• Try Cleaning and rebuilding your project.
• Click on the target you are running in xcode and check the frameworks section in ‘General’ Tab -> Check you have linked libFirebase.a there. If not click the “+” button at the bottom and
  add it. if you are not finding it, then right click the project -> Add Files to Project -> Add and link the project.
• Comment use_frameworks! in your pods file.
• If above is not working for you, then try these commands in terminal

  rm -rf ~/Library/Caches/CocoaPods;
  rm -rf Pods;
  rm -rf ~/Library/Developer/Xcode/DerivedData/*;
  pod deintegrate;
  pod setup;
  pod install;