Hi guys

We are trying to perform the step 3 on Creating a Xamarin.Android Application using this walkthrough:
https://developer.xamarin.com/guides/cross-platform/application_fundamentals/web_services/walkthrough_working_with_WCF/

But we found this error when we are trying to run the command line:

C:\Program Files (x86)\Microsoft SDKs\Silverlight\v5.0\Tools>SLsvcUtil.exe /noConfig http://localhost:8733/Design_Time_Addresses/wcfForcaVendasService/Service1/
Microsoft (R) Silverlight Service Model Proxy Generation Tool
[Microsoft (R) Silverlight SDK, Version 5.0.61118.0]
Copyright (c) Microsoft Corporation. All rights reserved.

Attempting to download metadata from 'http://localhost:8733/Design_Time_Addresses/wcfForcaVendasService/Service1/' using WS-Metadata Exchange or DISCO.
Error: An error occurred in the tool.

Error: Valor não pode ser nulo. (Value cannot be null)

Nome do parâmetro: config (Parameter's name: config)

Somebody can help us?
Many thanks
Daniel