login.logIn(withReadPermissions: ["public_profile","user_friends"], from: self) {

guard let request = FBSDKGraphRequest(graphPath: "/99999999923232321/friends", parameters: nil, httpMethod:"GET") else {
            fatalError("Unable to create the Facebook Request")
        }

        request.start(completionHandler: { (connection, result, error) in

            print(result)

        })

▿ Optional<String>
  - some : "The operation couldn’t be completed. (com.facebook.sdk.core error 8.)"