{:ok, :undefined, :undefined}

[hdcos]

When i launch the example request or this one : http://www.webservicex.net/New/Home/ServiceDetail/42

I get this answer from the service : {:ok, :undefined, :indefined}
Am I missing something?

here is my code:
Detergentex.init_model("http://www.webservicex.net/uszip.asmx?WSDL")
Detergentex.call("http://www.webservicex.net/uszip.asmx?WSDL", "GetInfoByZIP", ["35006"])

I tried with the detergent library (using single quotes) and I get the same result... :'(