C# Windows Mobile Webservice error

I'm building a c# windows mobile application that accesses a Webservice to obtain data, I know that the web service works fine but when i try to access it via the windows mobile application I get an error in the auto generated code

/// <remarks/>
public string EndGetManifest(System.IAsyncResult asyncResult) {
object[] results = this.EndInvoke(asyncResult);
return ((string)(results[0]));
}

the "results" object returns nothing, but the asyncResult tells me that it's completed ok.

I'm using visual studio 2003 with dot.net 1.1

any help would be greatly appreciated