iOS - Firebase error: Use of unresolved identifier FIRApp running supplied code

Question

When trying to configure XCode to work with Firebase 3, using the code in the setup docs gives me an error:

https://firebase.google.com/docs/ios/setup#add_the_sdk

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Answer 1

first make sure your Firebase version is 3 by use console to entering your project file and use pod update order to update your Firebase version to 3