Getting Possible SOAP version mismatch at client.

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Header><soap12:Upgrade xmlns:soap12="http://www.w3.org/2003/05/soap-envelope"><soap12:SupportedEnvelope qname="soap:Envelope" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" /><soap12:SupportedEnvelope qname="soap12:Envelope" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope" /></soap12:Upgrade></soap:Header><soap:Body><soap:Fault><faultcode>soap:VersionMismatch</faultcode><faultstring>System.Web.Services.Protocols.SoapException: Possible SOAP version mismatch: Envelope namespace  was unexpected. Expecting http://schemas.xmlsoap.org/soap/envelope/.
   at System.Web.Services.Protocols.SoapServerProtocol.CheckHelperVersion()
   at System.Web.Services.Protocols.SoapServerProtocol.Initialize()
   at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean&amp; abortProcessing)</faultstring><detail /></soap:Fault></soap:Body></soap:Envelope>

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