Getting Possible SOAP version mismatch at client.

This is being returned from my webservice to a client. Any ideas?

<?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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Rob GaudetAsked:
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ste5anSenior DeveloperCommented:
Add error handling?
Rob GaudetAuthor Commented:
Thanks, I figured this out. I was doing base64 encoding, the client was not.

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Rob GaudetAuthor Commented:
How do you close out a question!?
ste5anSenior DeveloperCommented:
Why not adding error handling? Sending a stack trace why soap to the client is not a good idea at all.
Rob GaudetAuthor Commented:
I figured out the problem on my own.
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SOAP Protocol

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