NS_ENUM(NSUInteger,FIRInstallationsErrorCode){/** Unknown error. See `userInfo` for details. */FIRInstallationsErrorCodeUnknown=0,/** Keychain error. See `userInfo` for details. */FIRInstallationsErrorCodeKeychain=1,/** Server unreachable. A network error or server is unavailable. See `userInfo` for details. */FIRInstallationsErrorCodeServerUnreachable=2,/** FirebaseApp configuration issues e.g. invalid GMP-App-ID, etc. See `userInfo` for details. */FIRInstallationsErrorCodeInvalidConfiguration=3,}