ios – How you can get FCM Token in Swift correctly

I’m attempting to get FCM Token in my app utilizing this code

        Messaging.messaging().token { token, error in
        
        if let error = error {
            print("Error fetching FCM Token: (error)");
        }
        else if let token = token {
            print("(token)");
        }
    }

And I get my output as beneath. I do not know why it offers error first and there’s FCM Token after few moments

Error fetching FCM Token: Error Area=com.google.fcm Code=505 "No APNS token specified earlier than fetching FCM Token"
UserInfo={NSLocalizedFailureReason=No APNS token specified earlier than fetching FCM Token}
APNs token retrieved: 32 bytes
Firebase registration token: Non-compulsory("ckoUPFil4UEtrH2wDCrDVZ:APA91bG7fsR4WdxhN6mSwj_pjoKrX9fNW8TDSlIs7YCDCqqMgTjxHp03te4DMcPD4Y2Rrhg3sM9gjcP_QKndTECeVcEDYaQVsGcmxcKxRRQHDOw_IVZYPsoPho3iYJteE74GHsuuIjHg")