error in POST REST webservice, stream must have single parameter

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REST

I am uploading a file via a webservice using REST and receiving an error message because I have multiple parameters in my POST WEBINVOKE.

this is error message...

For request in operation transferData to be a stream the operation must have a single parameter whose type is Stream.

I've read THOUSANDS of tutorials on this and I see other people have the same problem however I don't see a real solution for me.

any ideas on what

 namespace EngineAppServiceV001
{
the interface name "IService1" in both code and config file together.
[ServiceContract]
public interface IService1
{


    [OperationContract]
    [WebGet(UriTemplate = "/DoWork/{cid}",
      ResponseFormat = WebMessageFormat.Json,
      RequestFormat = WebMessageFormat.Json,
      BodyStyle = WebMessageBodyStyle.WrappedRequest)]
    DataSet DoWork(string cid);

    [OperationContract]
    [WebInvoke(Method = "POST",
        UriTemplate = "/UploadFile/{fileName}")]
    string transferData(string filename, Stream fileStream);


}

Here is my web.config


<bindings>
<basichttpbinding>
<binding maxbuffersize="2147483647" maxreceivedmessagesize="2147483647">
<readerquotas maxdepth="32" maxstringcontentlength="2147483647">
maxArrayLength="16348" maxBytesPerRead="4096" maxNameTableCharCount="16384" /&gt;
</readerquotas></binding>
</basichttpbinding>
<webhttpbinding>
<binding name="ServiceWebBindingName" transfermode="Streamed" maxbuffersize="2147483647" maxreceivedmessagesize="2147483647">
<security mode="None"></security>
</binding>
</webhttpbinding>
</bindings>

<services>
<service name="EngineAppServiceV001.Service1" behaviorconfiguration="ServiceBehaviour">
<endpoint address="" binding="webHttpBinding" contract="EngineAppServiceV001.IService1" behaviorconfiguration="web" />
</service>
</services>

<behaviors>

<servicebehaviors>
<behavior name="ServiceBehaviour">
<servicemetadata httpgetenabled="true" httpsgetenabled="true" />
<servicedebug includeexceptiondetailinfaults="true" />
</behavior>
</servicebehaviors>

<endpointbehaviors>
<behavior name="web">
<webhttp />
</behavior>
</endpointbehaviors>

</behaviors>