Forum OpenACS Development: got error in vb client when using soap tookit 3.0 for .net webservices

hi, i have to create vb client that consume .net web service my vb client code is
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Dim soapclient As MSSOAPLib30.SoapClient30
Dim strwsdl As String
Dim output As String

Set soapclient = New MSSOAPLib30.SoapClient30
strwsdl = "D:\vb\gsoapclient\GSoapWS.wsdl"
soapclient.ClientProperty("ServerHTTPRequest") = True
soapclient.MSSoapInit (strwsdl)
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when i have to create vb client i received these errors

"WSDLOperation:The operation UploadFile had an invalid parts attribute HRESULT=0x80004005: Unspecified error
- WSDLOperation:Initializing of the input message failed for operation UploadFile HRESULT=0x80004005: Unspecified error
- WSDLPort:An operation for port GSoapWS could not be initialized HRESULT=0x80004005: Unspecified error
- WSDLPort:Analyzing the binding information for port GSoapWS failed HRESULT=0x80004005: Unspecified error
- WSDLService:Initialization of the port for service GSoapWS failed HRESULT=0x80004005: Unspecified error
- WSDLReader:Analyzing the WSDL file failed HRESULT=0x80004005: Unspecified error
- Client:One of the parameters supplied is invalid. HRESULT=0x80070057: The parameter is incorrect."

please please help me out for the same....milons thanks