title: Value cannot be null Parameter name: source
body: <p>I'm consuming a webservice following method:</p>
  
  <pre><code>wsSascar2.SasIntegraWSClient w2 = new wsSascar2.SasIntegraWSClient();
  List&lt;wsSascar2.pacotePosicao&gt; lista = w2.obterPacotePosicoes("user", "password", 0).ToList();
  </code></pre>
  
  <p>But the following error is returned:</p>
  
  <blockquote>
    <p>Value cannot be null. Parameter name: source</p>
  </blockquote>
  
  <p>The problem is in my code or the return of the webservice?</p>
  
  <p>Webservice: <a href="http://sasintegra.sascar.com.br/SasIntegra/SasIntegraWSService?wsdl" rel="nofollow">http://sasintegra.sascar.com.br/SasIntegra/SasIntegraWSService?wsdl</a></p>
  
  <p>Thanks,</p>