When I run my swift 3.2 code with Xcode 9 beta 4 this is the error I get:
*** Terminating app due to uncaught exception 'com.firebase.core', reason: '[FIRApp configure]; (FirebaseApp.configure() in Swift) could not find a valid GoogleService-Info.plist in your project. Please download one from https://console.firebase.google.com/.'
I already have a GoogleService-Info.plist file that is named exactly like it should and it is valid.
Is there any trial to firebase or something like that?
Remove the Google-Info.plist
file from your project and try to add it from your project folder's option menu.
EDIT: this is how you remove a plist file Xcode 10 Error: Multiple commands produce