Build error !! - Add FIRApp configure.

[bigleesan]

Hello.
Spent a lot of time to build my project for IOS.
and I saved GoogleService-Info.plist in folder ( Project -> Resources )
I cannot find any reason why this would happen. Here is the code:

2020-07-09 09:53:20.006416+1200 pushtest[11839:871372] 6.27.0 - [Firebase/Core][I-COR000003] The default Firebase app has not yet been configured. Add [FIRApp configure]; (FirebaseApp.configure() in Swift) to your application initialization. Read more: https://goo.gl/ctyzm8.

Thanks.