Sign in with Apple in realm SwiftUI exception: unrecognized selector sent to instance

Question

I am trying to implement sign in with apple to Realm. I already did the configuration from the docs: https://www.mongodb.com/docs/atlas/app-services/authentication/apple/#std-label-apple-id-authentication

Now I am trying to add the sign in with Apple button and the flow.

The login button on SwiftUI:

SignInWithAppleButton(.signIn, onRequest: { request in
    isLoggingIn = true
    request.requestedScopes = [.email]
}, onCompletion: { result in
    switch result {
    case .success(let authResults):
        guard let credentials = authResults.credential as? ASAuthorizationAppleIDCredential,
              let identityToken = credentials.identityToken,
              let identityTokenString = String(data: identityToken, encoding: .utf8) else { return }
        
        repo.loginwithApple(appleTokenIDString: identityTokenString) { user, error in
            
        }
    case .failure(let error):
        isLoggingIn = false
    }
})

repo.loginwithApple calls the method from the shared kotlin repository:

suspend fun loginwithApple(appleTokenIDString: String): User {
    var credentials = Credentials.apple(idToken = appleTokenIDString)

    return appService.login(credentials = credentials)
}

Whenever I try to do the login with the apple sign in button I get this exception:

libc++abi: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SharedRealmRepo loginwithAppleAppleTokenIDString:completionHandler:]: unrecognized selector sent to instance 0x281fe4960'
terminating with uncaught exception of type NSException

Any idea why the exception happens?

Answer 1

It looks like removing the Output Files from XCode will solve the issue, but I do not know why.

Maybe someone has a explanation of why this happens. The output files will not let the realm repo re-build?