无法转换“(String!,NSError!)->”类型的值()'应为参数类型“GGLInstanceIDTokenHandler!”

我有这个问题 Google Cloud Messaging ( GCM )在重构为Swift 3之后。有人能帮忙吗?

我得到了这个错误:

在这里:

func application( _ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data ) {

// ...

GGLInstanceID.sharedInstance().tokenWithAuthorizedEntity(gcmSenderID, scope: kGGLInstanceIDScopeGCM, options: registrationOptions, handler: registrationHandler) 
}

此处的错误相同:

func onTokenRefresh() {
    GGLInstanceID.sharedInstance().token(withAuthorizedEntity: gcmSenderID, scope: kGGLInstanceIDScopeGCM, options: registrationOptions, handler: registrationHandler)
}

func registrationHandler(_ registrationToken: String!, error: NSError!) {
    // ...
}