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: \'[FIRAp
These steps solved my problem. FOllow these. 1.You must drag and drop the GoogleService-Info.plist file into your project in a location such as Shared Resources. When you have successfully added the file, you should also make sure to include it in the project build:
2.Double-check that in the "Build Phases" section of your project that your project is including GoogleService-Info.plist.
3.Double check the file name. The file name must be exactly GoogleService-Info.plist common misspellings include GoogleServices-Info.plist and GoogleService-info.plist - case sensitive and exactly named only will work.